Which are the terminal component of the complementary system?: (A) C6,C7,C8, (B) C7,C8,C9, (C) C3,C4,C5, (D) C5,C6,C7
Answer is B. Terminal components are C7, C8, and C9.They can directly kill some bacterial invaders (notably, many of the neisseriae) by forming a membrane attack complex and disrupting the integrity of the bacterial membrane, thus causing bacteriolysis. Ref: Harrison's Principles of Internal Medicine, 18e, Chapter 119.Introduction to Infectious Diseases.