Complement System MCQ Quiz | Immunology

Welcome to the Complement System MCQ Quiz, specifically designed for MBBS students to test and reinforce their understanding of this crucial part of the innate immune system. The complement system is a complex cascade of proteins that “complements” the action of antibodies in eliminating pathogens. This quiz covers the three activation pathways—Classical, Alternative, and Lectin—as well as the system’s key functions like opsonization, chemotaxis, and cell lysis via the Membrane Attack Complex (MAC). You will also be tested on regulatory proteins and the clinical implications of complement deficiencies. This quiz consists of 25 questions to challenge your knowledge. After submitting your answers, you can review your score and see the correct responses highlighted. You can also download all questions with their correct answers in a PDF format for future revision. Good luck!