ATI TEAS 7 Science Study Guide

The ATI TEAS 7 Science section covers Human Anatomy and Physiology, Biology, Chemistry, and Scientific Reasoning. Anatomy and Physiology receives the largest share of scored Science questions, but the section also expects you to read experiments, interpret data, understand cells and inheritance, and apply basic chemistry.

Memorizing lists won’t be enough. You need to understand what structures do, how processes connect, and what the evidence in a question actually supports.

This TEAS Science study guide explains the tested topics, high-value systems and processes, common mistakes, question-solving methods, and ways to practise under realistic timing.

Last reviewed: July 12, 2026

ATI TEAS 7 Science section at a glance

Science section detail	Current format
Questions delivered	50
Scored questions	44
Unscored pretest questions	6
Time limit	60 minutes
Average time available	About 72 seconds per question
Human Anatomy and Physiology	18 scored questions
Biology	9 scored questions
Chemistry	8 scored questions
Scientific Reasoning	9 scored questions

Science contains 50 delivered questions, including 44 scored questions and 6 unidentified pretest questions. You receive 60 minutes for the section. ATI assigns 18 scored questions to Human Anatomy and Physiology, 9 to Biology, 8 to Chemistry, and 9 to Scientific Reasoning.

Science is the third section of the exam, after Reading and Mathematics. Time does not carry over from one section to another. You can review and change answers while Science remains open, but you cannot return after closing the section.

What is tested on the ATI TEAS 7 Science section?

The official Science outline is divided into four areas.

Human Anatomy and Physiology

You should understand:

• General anatomical orientation
• Respiratory system
• Cardiovascular system
• Digestive system
• Nervous system
• Muscular system
• Male and female reproductive systems
• Integumentary system
• Endocrine system
• Urinary system
• Immune system
• Skeletal system

ATI’s outline names each of these systems as a Science objective.

Biology

The Biology objectives cover:

• Cell structure, function, and organization
• Genetic material and protein structure
• Mendelian inheritance
• Biological macromolecules
• The role of microorganisms in disease

Chemistry

The Chemistry portion covers:

• Basic atomic structure
• Physical properties and changes of matter
• Chemical reactions
• Factors that affect reactions
• Properties of solutions
• Acids and bases

Scientific Reasoning

You may need to:

• Use measurements and measurement tools
• Apply logic and evidence
• Predict relationships
• Interpret a scientific investigation
• Identify variables and controls
• Judge whether a conclusion follows from the results

These Biology, Chemistry, and Scientific Reasoning objectives come directly from the ATI TEAS 7 content outline.

How to study Human Anatomy and Physiology

Anatomy concerns structure. Physiology concerns function.

A question may ask you to identify an organ, but another may ask what happens when that organ fails or how it works with another body system. Study both parts together.

For each system, learn:

1. The main organs and structures
2. The direction in which materials move
3. The major function of each structure
4. The process that connects the structures
5. How the system supports homeostasis
6. How it interacts with other systems

Anatomical position and directional terms

Anatomical descriptions assume the body is standing upright, facing forward, with the arms at the sides and palms facing forward.

Common terms include:

Term	Meaning
Superior	Above or toward the head
Inferior	Below or toward the feet
Anterior	Toward the front
Posterior	Toward the back
Medial	Toward the midline
Lateral	Away from the midline
Proximal	Closer to the point of attachment
Distal	Farther from the point of attachment
Superficial	Near the body surface
Deep	Farther from the body surface

Example:

The elbow is proximal to the wrist because it is closer to the shoulder, where the limb attaches to the trunk.

The skin is superficial to the skeletal muscles.

Do not use everyday viewpoint. Anatomical right and left always refer to the patient’s right and left.

Homeostasis

Homeostasis is the maintenance of a relatively stable internal environment.

Body temperature, blood glucose, blood pressure, pH, and fluid balance are controlled within working ranges. The values can change, but regulatory systems act to keep them from drifting too far.

A basic feedback loop contains:

• A stimulus
• A receptor that detects the change
• A control center
• An effector
• A response

Most homeostatic control uses negative feedback. The response opposes the original change.

Example:

When blood glucose rises after a meal, insulin helps lower it. When blood glucose falls, glucagon helps raise it.

Positive feedback strengthens a change until a specific event is completed. Uterine contractions during childbirth are a standard example.

Cardiovascular system

The cardiovascular system moves blood through the heart, blood vessels, and tissues.

The four chambers are:

• Right atrium
• Right ventricle
• Left atrium
• Left ventricle

Follow blood flow in order:

1. Deoxygenated blood returns from the body through the venae cavae.
2. It enters the right atrium.
3. It passes through the tricuspid valve.
4. It enters the right ventricle.
5. It passes through the pulmonary valve.
6. It travels through the pulmonary arteries to the lungs.
7. Oxygenated blood returns through the pulmonary veins.
8. It enters the left atrium.
9. It passes through the mitral valve.
10. It enters the left ventricle.
11. It passes through the aortic valve.
12. It enters the aorta and travels to the body.

Two exceptions cause frequent errors:

• Pulmonary arteries carry deoxygenated blood.
• Pulmonary veins carry oxygenated blood.

Arteries are defined by carrying blood away from the heart. Veins carry blood toward the heart. Oxygen content is not the defining feature.

The left ventricle has a thicker wall than the right because it pumps blood through the systemic circulation, which requires greater pressure.

Respiratory system

The respiratory system brings oxygen into the body and removes carbon dioxide.

Air follows this route:

1. Nose or mouth
2. Pharynx
3. Larynx
4. Trachea
5. Bronchi
6. Bronchioles
7. Alveoli

Gas exchange occurs at the alveoli.

Oxygen moves from alveolar air into pulmonary capillary blood. Carbon dioxide moves from the blood into the alveoli and is exhaled.

The diaphragm is the main muscle of breathing.

During inhalation:

• The diaphragm contracts and moves downward.
• Thoracic volume increases.
• Pressure inside the lungs decreases.
• Air moves inward.

During exhalation at rest:

• The diaphragm relaxes.
• Thoracic volume decreases.
• Pressure rises.
• Air moves outward.

The respiratory and cardiovascular systems work as a pair. The lungs exchange gases; the blood transports them.

Digestive system

The digestive system breaks food into smaller molecules, absorbs nutrients, and eliminates indigestible material.

Food passes through:

1. Mouth
2. Pharynx
3. Esophagus
4. Stomach
5. Small intestine
6. Large intestine
7. Rectum
8. Anus

Most nutrient absorption occurs in the small intestine. Its villi and microvilli increase the available surface area.

The major sections of the small intestine are:

• Duodenum
• Jejunum
• Ileum

The large intestine absorbs water and electrolytes and compacts fecal material.

Accessory organs help digestion even though food does not pass through them:

• The liver produces bile.
• The gallbladder stores and concentrates bile.
• The pancreas releases digestive enzymes and bicarbonate into the small intestine.

The pancreas also has endocrine functions because it produces hormones such as insulin and glucagon.

Nervous system

The nervous system sends rapid electrical and chemical signals.

Its two broad divisions are:

• Central nervous system: brain and spinal cord
• Peripheral nervous system: nerves outside the brain and spinal cord

A neuron usually contains:

• Dendrites, which receive signals
• A cell body
• An axon, which carries the signal away
• Axon terminals, which communicate with another cell

At a chemical synapse, a neurotransmitter crosses the gap between cells and binds to receptors on the next cell.

The peripheral nervous system includes:

• Somatic division, associated with voluntary skeletal muscle control
• Autonomic division, which regulates involuntary functions

The autonomic system includes:

• Sympathetic division, associated with “fight or flight”
• Parasympathetic division, associated with “rest and digest”

These divisions usually produce opposite effects on the same organ.

Endocrine system

The endocrine system uses hormones carried in the bloodstream.

Its effects often begin more slowly than nervous-system signals but may last longer.

Major glands include:

Gland	Selected function
Pituitary	Regulates several other endocrine glands
Thyroid	Influences metabolism
Parathyroids	Help regulate calcium
Adrenal glands	Produce hormones involved in stress and fluid balance
Pancreas	Helps regulate blood glucose
Ovaries	Produce estrogen and progesterone
Testes	Produce testosterone
Pineal gland	Produces melatonin

Hormones act only on target cells with the correct receptors.

Feedback matters. For example, rising thyroid hormone levels reduce signals from the hypothalamus and pituitary that stimulate further thyroid-hormone production.

Urinary system

The urinary system removes metabolic waste and helps regulate water, electrolytes, blood pressure, and acid-base balance.

The main structures are:

• Kidneys
• Ureters
• Urinary bladder
• Urethra

A nephron is the functional unit of the kidney.

Urine formation involves:

1. Filtration
2. Reabsorption
3. Secretion
4. Excretion

Filtration moves water and small solutes from blood into the nephron.

Reabsorption returns needed substances to the blood.

Secretion moves selected substances from the blood into the tubular fluid.

The ureters carry urine from the kidneys to the bladder. The urethra carries urine out of the body.

Immune and lymphatic systems

The immune system protects the body from pathogens and abnormal cells.

Innate immunity responds quickly and nonspecifically. It includes:

• Skin and mucous membranes
• Inflammation
• Phagocytic cells
• Fever
• Certain antimicrobial proteins

Adaptive immunity targets specific antigens and forms memory.

B lymphocytes can develop into plasma cells that produce antibodies.

T lymphocytes have several roles, including helping coordinate immune responses and destroying infected cells.

The lymphatic system:

• Returns excess tissue fluid to the bloodstream
• Transports certain absorbed fats
• Supports immune surveillance

Lymph nodes filter lymph. The spleen filters blood and supports immune functions.

Skeletal system

The skeletal system provides support, protects organs, stores minerals, produces blood cells, and works with muscles to create movement.

Bones contain:

• Compact bone
• Spongy bone
• Bone marrow
• Blood vessels
• Living bone cells

Red bone marrow produces blood cells.

Joints connect bones. Their structure affects the kind and range of movement.

Ligaments connect bone to bone.

Tendons connect muscle to bone.

This distinction appears often enough to memorize directly.

Muscular system

The three muscle-tissue types are:

Muscle type	Control	Main location
Skeletal	Usually voluntary	Attached to bones
Cardiac	Involuntary	Heart
Smooth	Involuntary	Walls of hollow organs and vessels

Skeletal muscles usually work in opposing pairs.

When the biceps contracts to flex the elbow, the triceps relaxes. During elbow extension, the relationship reverses.

Muscle contraction requires interaction between actin and myosin, along with calcium and ATP.

Integumentary system

The integumentary system includes the skin, hair, nails, sweat glands, and sebaceous glands.

Its functions include:

• Physical protection
• Reducing water loss
• Temperature regulation
• Sensation
• Vitamin D production
• Limiting pathogen entry

The epidermis is the outer layer.

The dermis contains blood vessels, nerves, glands, and connective tissue.

The hypodermis lies beneath the skin and contains adipose and connective tissue.

Sweating and changes in skin blood flow help regulate temperature.

Reproductive systems

The male reproductive system produces and delivers sperm and produces sex hormones.

Major structures include:

• Testes
• Epididymides
• Vasa deferentia
• Seminal vesicles
• Prostate
• Urethra
• Penis

Sperm are produced in the testes and mature in the epididymides.

The female reproductive system produces ova, supports fertilization, and can support pregnancy.

Major structures include:

• Ovaries
• Uterine tubes
• Uterus
• Cervix
• Vagina

Ovulation releases an oocyte from an ovary.

Fertilization usually occurs in a uterine tube. Implantation normally occurs in the uterine lining.

Biology review

Biology questions connect cell structure with genetics, proteins, inheritance, macromolecules, and microorganisms.

Cell structure and function

Cells are the basic units of living organisms.

Prokaryotic cells lack a membrane-bound nucleus. Bacteria are prokaryotes.

Eukaryotic cells contain a nucleus and membrane-bound organelles. Animals, plants, fungi, and protists are eukaryotes.

Important organelles include:

Organelle	Main function
Nucleus	Stores most cellular DNA
Ribosome	Builds proteins
Rough endoplasmic reticulum	Processes proteins for transport or secretion
Smooth endoplasmic reticulum	Lipid synthesis and detoxification
Golgi apparatus	Modifies, sorts, and packages cellular products
Mitochondrion	Produces much of the cell’s ATP
Lysosome	Contains digestive enzymes
Cell membrane	Controls movement into and out of the cell
Cytoskeleton	Supports shape, transport, and movement

Ribosomes are not membrane-bound. Both prokaryotic and eukaryotic cells have them.

Cell membrane transport

The cell membrane is selectively permeable.

Passive transport does not require direct cellular energy.

Examples include:

• Simple diffusion
• Facilitated diffusion
• Osmosis

Diffusion moves particles from an area of higher concentration to lower concentration.

Osmosis refers to the movement of water across a selectively permeable membrane.

Active transport requires energy and can move substances against their concentration gradient.

Endocytosis brings material into a cell through membrane-bound vesicles.

Exocytosis releases material from the cell.

DNA, RNA, and protein synthesis

DNA stores genetic information.

A gene is a segment of DNA that contains information used to produce a functional product, often a protein.

The basic pathway is:

DNA → RNA → Protein

During transcription, a DNA sequence is used to make RNA.

During translation, ribosomes read messenger RNA and assemble amino acids into a polypeptide.

Transfer RNA carries amino acids to the ribosome.

A change in DNA can alter the RNA sequence and potentially change the amino acid sequence of a protein. Some changes have no effect; others alter function.

Mitosis and meiosis

Mitosis produces two genetically similar daughter cells and supports growth, repair, and replacement.

Meiosis produces haploid gametes and increases genetic variation.

Feature	Mitosis	Meiosis
Number of divisions	One	Two
Daughter cells	Two	Four
Chromosome number	Maintained	Halved
Genetic similarity	Usually similar to parent cell	Genetically varied
Main role	Growth and repair	Gamete production

Do not confuse DNA replication with cell division. DNA replicates before mitosis or meiosis begins.

Mendelian inheritance

An allele is a version of a gene.

A genotype describes an organism’s allele combination.

A phenotype is the observable expression of a trait.

Common terms:

• Homozygous: two identical alleles
• Heterozygous: two different alleles
• Dominant: expressed when at least one copy is present in a simple dominant-recessive model
• Recessive: expressed when no dominant allele is present in that model

Example:

Let B represent a dominant allele and b a recessive allele.

Cross:

Bb × Bb

Possible offspring genotypes:

• BB
• Bb
• Bb
• bb

Genotype ratio:

1 BB : 2 Bb : 1 bb

Phenotype ratio under complete dominance:

3 dominant : 1 recessive

Probability describes likelihood, not a guaranteed outcome for a small number of offspring.

Biological macromolecules

Macromolecule	Building blocks	Selected functions
Carbohydrates	Monosaccharides	Immediate energy and structural roles
Proteins	Amino acids	Enzymes, structure, transport, signaling
Lipids	Glycerol and fatty acids are common components	Long-term energy, membranes, insulation, hormones
Nucleic acids	Nucleotides	Store and transmit genetic information

Enzymes are usually proteins that speed reactions by lowering activation energy.

They are specific to their substrates and can be affected by temperature and pH.

Microorganisms and disease

Major groups include:

• Bacteria
• Viruses
• Fungi
• Protozoa

Bacteria are cells. Viruses are not cells and require a host cell to reproduce.

Antibiotics act against susceptible bacteria. They do not treat viral infections.

Pathogenicity refers to the ability to cause disease.

Transmission may occur through:

• Direct contact
• Droplets
• Airborne spread
• Contaminated food or water
• Vectors
• Bodily fluids

The presence of a microorganism does not always mean disease. Some microorganisms are harmless or beneficial in their normal locations.

Chemistry review

The Chemistry questions are basic, but careless language can cause mistakes. Learn the distinctions.

Atomic structure

Atoms contain:

• Protons, with a positive charge
• Neutrons, with no charge
• Electrons, with a negative charge

Protons and neutrons are in the nucleus. Electrons occupy regions around the nucleus.

The atomic number equals the number of protons.

An isotope has the same number of protons as other atoms of the element but a different number of neutrons.

An ion forms when an atom gains or loses electrons.

• Losing electrons produces a positive ion.
• Gaining electrons produces a negative ion.

Elements, compounds, and mixtures

An element contains one type of atom.

A compound contains elements chemically combined in fixed proportions.

A mixture contains substances physically combined. Its components retain their identities and can often be separated physically.

Examples:

• Oxygen gas: element
• Water: compound
• Saltwater: mixture

A homogeneous mixture has a uniform composition.

A heterogeneous mixture does not.

Physical and chemical changes

A physical change alters form or state without producing a new substance.

Examples:

• Melting
• Freezing
• Cutting
• Dissolving, in many ordinary cases

A chemical change produces one or more new substances.

Possible signs include:

• Gas production
• Formation of a precipitate
• Persistent color change
• Energy change
• New odor

A sign alone does not prove a chemical reaction. The question should indicate that the substance’s composition changed.

Chemical reactions

Reactants are the starting substances.

Products are the substances formed.

A chemical equation must be balanced because atoms are rearranged rather than created or destroyed.

Example:

2H₂ + O₂ → 2H₂O

Both sides contain four hydrogen atoms and two oxygen atoms.

Coefficients change the number of molecules or formula units. Subscripts are part of the chemical formula and should not be changed merely to balance an equation.

Factors affecting reaction rate

A reaction may occur faster when:

• Temperature rises
• Reactant concentration rises
• Surface area increases
• A catalyst is added

These changes generally increase the number or effectiveness of particle collisions.

A catalyst speeds a reaction without being permanently consumed. It does not change the amount of energy stored in the reactants or products.

Solutions

A solution contains:

• Solute: the substance dissolved
• Solvent: the substance doing the dissolving

Concentration describes the amount of solute in a given amount of solution.

A saturated solution contains the maximum amount of dissolved solute possible under the stated conditions.

Solubility can change with temperature and pressure, depending on the substances involved.

“Concentrated” and “saturated” do not mean the same thing. A concentrated solution has a relatively large amount of solute. A saturated solution has reached its solubility limit.

Acids and bases

Acids increase hydrogen-ion concentration in aqueous solution.

Bases decrease hydrogen-ion concentration or increase hydroxide-ion concentration, depending on the model being used.

The pH scale is logarithmic.

• A pH below 7 is acidic.
• A pH of 7 is neutral under standard classroom conditions.
• A pH above 7 is basic.

A solution with pH 3 is more acidic than one with pH 5.

A change of one pH unit represents a tenfold change in hydrogen-ion concentration.

Buffers resist sharp changes in pH.

Neutralization involves an acid and a base reacting to form products that commonly include water and a salt.

Scientific Reasoning review

Scientific Reasoning questions often provide all the content you need. The challenge is reading the design carefully.

The scientific method

A typical investigation may include:

1. Observation
2. Question
3. Hypothesis
4. Experiment
5. Data collection
6. Analysis
7. Conclusion
8. Replication or revision

Real investigations do not always follow a perfectly straight sequence, but this framework helps organize questions.

Hypotheses

A useful hypothesis is:

• Testable
• Specific
• Connected to measurable variables
• Capable of being supported or not supported by evidence

Example:

If the temperature of the solution increases, then the tablet will dissolve faster.

The hypothesis identifies a predicted relationship between temperature and dissolving time.

Independent and dependent variables

The independent variable is the factor intentionally changed.

The dependent variable is the outcome measured.

In an experiment testing how light duration affects plant height:

• Independent variable: hours of light
• Dependent variable: plant height

Controlled variables are kept as similar as possible between groups.

Examples might include:

• Plant species
• Soil type
• Water amount
• Container size
• Starting age

Experimental and control groups

The experimental group receives the treatment or condition being studied.

The control group provides a comparison.

A control does not always mean “no treatment.” It may receive a standard treatment, placebo, or baseline condition, depending on the question.

Accuracy and precision

Accuracy describes how close a measurement is to the accepted or true value.

Precision describes how close repeated measurements are to one another.

A set of measurements can be:

• Accurate and precise
• Precise but inaccurate
• Accurate on average but imprecise
• Neither

Reliability and validity

Reliability concerns consistency.

If repeated trials produce similar results, reliability improves.

Validity concerns whether the study measures what it is meant to measure and whether the conclusion is supported by the design.

Repeating a flawed experiment may produce reliable but invalid results.

Correlation and causation

Correlation means two variables change in a related pattern.

Causation means one variable produces a change in the other.

A correlation alone does not prove causation because another variable may influence both.

Random assignment, control of confounding variables, and a suitable experimental design strengthen causal conclusions.

Sample size and repeated trials

Larger samples and repeated trials can reduce the influence of chance variation.

They do not automatically correct:

• Poor measurement
• Biased sampling
• Missing controls
• Incorrect procedures
• A vague outcome definition

Interpreting tables and graphs

Before answering:

1. Read the title.
2. Identify the independent and dependent variables.
3. Check both axes.
4. Note the units.
5. Read the legend.
6. Look for trends and exceptions.
7. Check whether error bars or ranges are provided.
8. State only what the data support.

A graph can show that one group had a higher average. It cannot prove why unless the experiment was designed to test that cause.

High-value Science processes to understand

Some topics are better learned as a sequence than as isolated facts.

Blood flow through the heart and lungs

Use this shortened path:

Body → Right heart → Lungs → Left heart → Body

Then add the chambers, valves, and vessels.

If you can explain why each step occurs, you are less likely to reverse the route.

Gas exchange

Remember three connected ideas:

• Ventilation moves air.
• Diffusion moves oxygen and carbon dioxide across respiratory surfaces.
• Circulation transports the gases.

A question may change one part of the process and ask what happens downstream.

Digestion and absorption

Learn:

• Where mechanical and chemical digestion occur
• Which organs release enzymes or bile
• Where most nutrients are absorbed
• Where most remaining water is absorbed

The organ that produces a substance may not be the organ that stores or releases it.

Hormonal feedback

Identify:

1. The variable being regulated
2. The gland or organ detecting or responding to change
3. The hormone released
4. The target tissue
5. The response
6. How the response affects further hormone release

Neuron signaling

Follow:

Dendrites → Cell body → Axon → Axon terminal → Synapse → Next cell

A neurotransmitter crosses the synapse. The electrical signal does not simply jump through empty space as an unchanged electrical current.

Urine formation

Use:

Filtration → Reabsorption → Secretion → Excretion

Ask what moves, where it moves, and whether it returns to blood or enters tubular fluid.

DNA to protein

Use:

DNA → Transcription → RNA → Translation → Protein

Keep location in mind:

• In eukaryotic cells, transcription occurs in the nucleus.
• Translation occurs at ribosomes.

Mitosis versus meiosis

Do not rely only on “two cells versus four cells.”

Know:

• Purpose
• Number of divisions
• Chromosome number
• Genetic similarity
• Where each process is used

Acid-base interpretation

Read the direction carefully.

Lower pH means more acidic.

Higher pH means more basic.

Because the scale is logarithmic, a two-unit difference is larger than it looks.

Experimental design

A clean method:

1. Identify the question.
2. Find what was changed.
3. Find what was measured.
4. Identify the comparison.
5. Check what was kept constant.
6. Read the results.
7. Decide whether the conclusion stays within the evidence.

How to answer diagrams, graphs, and experiment questions

Start with labels

Do not identify a structure from shape alone when labels, arrows, orientation, or a legend are available.

In a body diagram, confirm:

• Direction
• Side of the body
• Organ system
• Relative location
• Where the arrow ends

Follow arrows in order

An arrow may represent:

• Material flow
• Nerve signaling
• Blood movement
• Hormone action
• Energy transfer
• A process sequence

Read where it starts and ends. Reversing one arrow can reverse the entire answer.

Check graph units

A graph may use:

• Seconds rather than minutes
• Milligrams rather than grams
• Percentage change rather than raw amount
• A shortened vertical scale

Read every axis before comparing points.

Separate observation from explanation

Observation:

Group B had a higher mean growth rate than Group A.

Explanation:

The treatment caused the higher growth rate.

The first statement may be directly shown by the graph. The second needs a suitable study design.

Use the question’s evidence

You may know more about the topic than the passage provides. Do not use outside information to contradict the experiment unless the question asks you to evaluate the design with scientific principles.

Common ATI TEAS Science mistakes

Mistake	Why it happens	Better approach
Memorizing organ names without learning processes	Lists feel easier than pathways	Follow material, signals, or blood through the system
Assuming every artery carries oxygenated blood	The general pattern is overapplied	Define arteries by direction away from the heart
Confusing hormones with glands	The names are studied separately	Pair each hormone with its source and target
Reversing independent and dependent variables	Both appear in the same experiment	Ask what was changed and what was measured
Treating correlation as causation	Two lines move together	Check whether the design controls alternative causes
Mixing up mitosis and meiosis	Both involve DNA and division	Compare purpose, products, and chromosome number
Reading low pH as a weak acid	“Low” sounds less intense	Lower pH means greater acidity
Calling any consistent study valid	Reliability and validity sound similar	Consistency does not prove the design measures the right thing
Ignoring units on a graph	The overall shape looks obvious	Read axes and units before interpreting the trend
Assuming an unscored question will look unusual	Students try to identify pretest items	Treat every question as scored
Choosing the familiar term	One option was recently studied	Explain how the option answers the exact question
Spending too long recalling one fact	Science has many content areas	Mark the item and protect time for questions you can solve

How to manage the 60-minute Science section

You have about 72 seconds per delivered question on average. ATI describes Science pacing as roughly 1.2 minutes per question.

Use flexible checkpoints:

Time remaining	Approximate progress target
48 minutes	Around question 10
36 minutes	Around question 20
24 minutes	Around question 30
12 minutes	Around question 40
Final minutes	Finish blanks and review marked questions

These are practice checkpoints, not ATI rules.

A direct anatomy question may take 20 seconds. An experiment with a table may take two minutes. Save time on straightforward items so you can spend it where interpretation is needed.

If you cannot recall a fact after a focused attempt, mark the question and move on. Staring at it rarely brings the answer back.

Mini ATI TEAS 7 Science practice

The following questions were written for this study guide. They are not official ATI questions.

Question 1

Which structure carries oxygenated blood from the lungs to the heart?

A. Aorta
B. Pulmonary artery
C. Pulmonary vein
D. Superior vena cava

Question 2

What happens during normal inhalation?

A. The diaphragm relaxes and thoracic volume decreases.
B. The diaphragm contracts and thoracic volume increases.
C. Pressure in the lungs rises above atmospheric pressure.
D. Air moves out of the lungs.

Question 3

Which organ produces bile?

A. Gallbladder
B. Liver
C. Pancreas
D. Stomach

Question 4

Which structure carries urine from a kidney to the urinary bladder?

A. Urethra
B. Nephron
C. Ureter
D. Renal artery

Question 5

Which type of tissue connects muscle to bone?

A. Cartilage
B. Ligament
C. Tendon
D. Adipose tissue

Question 6

Which response is part of adaptive immunity?

A. Intact skin preventing entry
B. Stomach acid destroying pathogens
C. Antibody production by plasma cells
D. Inflammation after tissue injury

Question 7

Which organelle is the main site of protein synthesis?

A. Lysosome
B. Ribosome
C. Golgi apparatus
D. Mitochondrion

Question 8

A cell is placed in a solution with a lower solute concentration than the cell interior. Which movement is most likely?

A. Water moves into the cell.
B. Water moves out of the cell.
C. Solute leaves through active transport only.
D. No water movement occurs.

Question 9

Two heterozygous parents are crossed for a trait with complete dominance: Aa × Aa. What is the probability of an offspring with genotype aa?

A. 0%
B. 25%
C. 50%
D. 75%

Question 10

Which process produces four haploid cells?

A. Binary fission
B. Mitosis
C. Meiosis
D. Transcription

Question 11

Which particle determines an element’s atomic number?

A. Electron
B. Neutron
C. Proton
D. Isotope

Question 12

Which change is chemical?

A. Ice melting
B. Paper being cut
C. Iron forming rust
D. Water boiling

Question 13

Which change would usually increase the rate of a reaction involving a solid reactant?

A. Decreasing its surface area
B. Lowering the temperature
C. Crushing the solid into smaller pieces
D. Removing reactant particles

Question 14

Which solution is the most acidic?

A. pH 2
B. pH 5
C. pH 7
D. pH 10

Question 15

A researcher tests whether fertilizer amount affects plant height. Which is the dependent variable?

A. Type of plant
B. Fertilizer amount
C. Plant height
D. Container size

Question 16

Repeated measurements are close to one another but far from the accepted value. The measurements are:

A. Accurate and precise
B. Accurate but not precise
C. Precise but not accurate
D. Neither accurate nor precise

Question 17

Researchers find that students who sleep longer tend to report better concentration. Which conclusion is best supported?

A. Longer sleep always causes better concentration.
B. Concentration causes students to sleep longer.
C. Sleep duration and reported concentration are associated.
D. No relationship exists between the variables.

Question 18

Three identical bacterial cultures receive the same treatment. Their measured growth rates are nearly identical. Which quality is most directly supported?

A. Reliability
B. Bias
C. Causation
D. Randomization

Answers and explanations

1. C: Pulmonary vein

Pulmonary veins return oxygenated blood from the lungs to the left atrium. Vessels are classified as arteries or veins by their direction relative to the heart.

2. B: The diaphragm contracts and thoracic volume increases

Contraction moves the diaphragm downward. Thoracic volume rises, pressure inside the lungs falls, and air moves inward.

3. B: Liver

The liver produces bile. The gallbladder stores and concentrates it.

4. C: Ureter

Each ureter carries urine from a kidney to the bladder. The urethra carries urine from the bladder out of the body.

5. C: Tendon

A tendon connects muscle to bone. A ligament connects bone to bone.

6. C: Antibody production by plasma cells

Antibody production is a specific adaptive response. Skin, stomach acid, and inflammation belong to innate defenses.

7. B: Ribosome

Ribosomes assemble amino acids into proteins. They may be free in the cytoplasm or attached to rough endoplasmic reticulum.

8. A: Water moves into the cell

The external solution has less solute and therefore relatively more free water. Water moves into the cell by osmosis.

9. B: 25%

The possible genotypes are AA, Aa, Aa, and aa. One of four is aa.

10. C: Meiosis

Meiosis includes two divisions and usually produces four haploid cells.

11. C: Proton

The number of protons defines the element and equals its atomic number.

12. C: Iron forming rust

Rusting produces new substances, so it is a chemical change. Melting, cutting, and boiling are physical changes.

13. C: Crushing the solid into smaller pieces

Smaller pieces expose more surface area, allowing more particle collisions.

14. A: pH 2

Lower pH indicates greater acidity.

15. C: Plant height

The researcher changes fertilizer amount and measures plant height. The measured outcome is the dependent variable.

16. C: Precise but not accurate

The measurements agree with one another, showing precision, but they are far from the accepted value.

17. C: Sleep duration and reported concentration are associated

The finding shows a relationship. It does not prove which variable causes the other or rule out other explanations.

18. A: Reliability

Consistent results across repeated cultures support reliability. Consistency alone does not prove validity or causation.

Free ATI TEAS 7 Science practice tests

After reviewing the four Science areas, take a timed test without keeping the guide open. The result should show whether your main problem is recall, interpretation, or pacing.

Pharmacy Freak currently offers two free Science tests:

• ATI TEAS 7 Science Practice Test 1
• ATI TEAS 7 Science Practice Test 2

Each test includes:

• 30 Science questions
• A 36-minute timer
• 12 Anatomy and Physiology questions
• 6 Biology questions
• 6 Chemistry questions
• 6 Scientific Reasoning questions
• Multiple TEAS-style response formats
• Instant results
• Explanations for each question
• Topic-wise performance analysis
• A downloadable PDF review
• No login requirement

The tests follow a scaled Science timing pace and keep the four areas visible in the result report.

Why Pharmacy Freak Science tests compare well with other available tests

Some practice tests end with a total percentage. That tells you how many questions you missed, but it does not show whether the weakness came from Anatomy and Physiology, Chemistry, Biology, or interpreting an experiment.

Pharmacy Freak gives you more to work with:

• The test is timed.
• You receive the result immediately.
• Every question has an explanation.
• Performance is separated by topic.
• You can download the review as a PDF.
• You do not need to create an account.

This makes the tests more useful for revision than a score-only quiz. The difference is in the feedback. You can see what went wrong and choose the next topic instead of taking another test at random.

Pharmacy Freak practice percentages are not official ATI equated scores and do not predict admission outcomes.

How to use both Science tests

Use the tests as separate checkpoints.

1. Complete your first Science review.
2. Take Science Practice Test 1.
3. Separate knowledge errors from reasoning errors.
4. Review the weakest content area.
5. Practise diagrams, pathways, or experiments from that area.
6. Take Science Practice Test 2 under the full timer.
7. Compare the topic-wise results and PDF reviews.

Avoid taking both tests back-to-back. The review between them is where most of the improvement should happen.

When should you take a mixed TEAS practice test?

A Science-only test lets you stay in one subject. The official TEAS requires you to complete Reading and Mathematics before Science, then continue into English and Language Usage.

After focused Science practice, take Free TEAS Practice Test 3.

The free mixed set contains 50 questions across all four TEAS subjects and uses a 61-minute timer. It provides instant scoring, question-by-question explanations, section-wise analysis, PDF review, and no-login access.

Use the mixed result to answer a broader question:

Can I recognize and apply Science concepts after switching between other subjects?

You can browse all available resources through the ATI TEAS practice-test hub.

When should you use a full-length TEAS 7 practice test?

Use a full-length test after you have reviewed your weaker content areas and completed focused practice.

A complete simulation can reveal whether you can:

• Maintain concentration through Reading and Math before Science
• Complete 50 Science questions in 60 minutes
• Interpret unfamiliar diagrams without losing time
• Mark difficult questions and return to them
• Continue into the final English section
• Maintain accuracy across 170 questions
• Use section results to plan the next round of study

The Pharmacy Freak full-length ATI TEAS 7 practice-test package includes 10 complete practice exams for $9.

Each exam delivers 170 questions across four separately timed sections. It includes 150 scored and 20 unidentified unscored questions, server-controlled timing, automatic saving, a question navigator, Mark for Review, a built-in Math calculator, an optional break, locked submitted sections, emailed results, section-level analysis, and a downloadable PDF report.

Compared with short tests presented as complete preparation, these exams reproduce more of the workload that affects performance: section order, full question volume, timing, review decisions, and fatigue.

Do not take all 10 tests in quick succession. Space them out. Review the report, repair the weak areas, and then use the next test to see whether the change held under time pressure.

Frequently asked questions

How many Science questions are on the ATI TEAS 7?

The Science section delivers 50 questions. Forty-four are scored and six are unidentified pretest questions.

How much time is allowed for TEAS Science?

You receive 60 minutes for Science, which is about 72 seconds per delivered question on average. Time from earlier sections cannot be carried into Science.

What are the four ATI TEAS 7 Science areas?

The four areas are Human Anatomy and Physiology, Biology, Chemistry, and Scientific Reasoning. They contain 18, 9, 8, and 9 scored questions respectively.

How much Anatomy and Physiology is on the TEAS?

Human Anatomy and Physiology contains 18 of the 44 scored Science questions. It is the largest Science sub-content area.

What Anatomy and Physiology systems should I study?

ATI lists general anatomical orientation and the respiratory, cardiovascular, digestive, nervous, muscular, reproductive, integumentary, endocrine, urinary, immune, and skeletal systems.

What should I study first for TEAS Science?

Begin with Human Anatomy and Physiology because it receives the largest share of scored Science questions. Start with blood flow, respiration, digestion, homeostasis, endocrine feedback, nervous signaling, and kidney function.

Then review cells and genetics, basic Chemistry, and experimental design. Take a diagnostic Science test before assuming which area is weakest.

Is Chemistry difficult on the ATI TEAS 7?

The published Chemistry objectives focus on atomic structure, matter, reactions, reaction conditions, solutions, acids, and bases.

The questions usually require clear understanding of basic relationships rather than advanced college-level calculations.

Do I need to memorize every body-system detail?

No. Focus on structures, functions, pathways, feedback, and system interactions.

For example, knowing the names of the heart chambers is useful. Being able to trace blood through those chambers is more valuable.

Are diagrams and experiment questions included?

ATI’s exam format includes hot-spot and other alternate item types, and the Science objectives require students to use measurements, evidence, predicted relationships, and scientific investigations.

Practise reading labels, axes, arrows, tables, and experimental setups.

How can I improve Scientific Reasoning?

For every investigation, identify:

• What was changed
• What was measured
• What was controlled
• What comparison was used
• What the results show
• Whether the conclusion goes beyond the evidence

Reviewing these six points is more reliable than memorizing definitions in isolation.

Why are Pharmacy Freak Science tests better than basic online quizzes?

They provide timed 30-question practice, multiple response formats, instant results, explanations for every question, topic-wise analysis, and a downloadable PDF review. They are free and do not require login.

A basic score-only quiz tells you how many answers were wrong. Pharmacy Freak also shows which Science area needs more work and gives you material to review.

Is a Pharmacy Freak Science score an official ATI score?

No. It is a practice percentage used for study tracking.

ATI’s official content-area scores are equated and should not be calculated or interpreted as a simple raw practice percentage.

Final TEAS Science study checklist

Before moving from content review to full-length testing, check that you can:

• Use anatomical directional terms correctly
• Explain negative feedback
• Trace blood through the heart and lungs
• Describe inhalation and exhalation
• Follow food through the digestive tract
• Match accessory digestive organs with their functions
• Identify the main parts of a neuron
• Compare sympathetic and parasympathetic activity
• Match major endocrine glands with their roles
• Explain filtration, reabsorption, secretion, and excretion
• Compare innate and adaptive immunity
• Distinguish tendons from ligaments
• Compare skeletal, smooth, and cardiac muscle
• Identify the main reproductive structures
• Match cell organelles with their functions
• Compare passive and active transport
• Follow DNA through transcription and translation
• Compare mitosis with meiosis
• Solve a basic Punnett-square problem
• Match macromolecules with their building blocks
• Distinguish bacteria from viruses
• Identify protons, neutrons, and electrons
• Separate physical changes from chemical changes
• Explain factors that affect reaction rate
• Interpret concentration, saturation, acids, bases, and pH
• Identify independent and dependent variables
• Distinguish accuracy from precision
• Distinguish reliability from validity
• Avoid treating correlation as causation
• Read graph axes, units, and legends before answering
• Complete 30 Science questions in 36 minutes
• Review topic-level results rather than only the total score
• Apply Science knowledge during a mixed test
• Use a full-length simulation after repairing major weaknesses

Sources and independence statement

The Science question count, time limit, scored-question distribution, sub-content areas, and official objectives were checked against ATI’s current exam details, Help Center, and ATI TEAS Version 7 content outline on July 12, 2026.

Pharmacy Freak is an independent educational resource and is not affiliated with or endorsed by Assessment Technologies Institute. ATI and TEAS are trademarks of their respective owner.