Immune System Quizlet Related

Review Immune System Quizlet related questions and content

Which of the following complement proteins is not part of the membrane attack complex?

  • A. C5a
  • B. C5b
  • C. C6
  • D. C7
Correct Answer: A

Rationale: The correct answer is A: C5a. C5a is not part of the membrane attack complex (MAC). The MAC consists of C5b, C6, C7, C8, and multiple C9 molecules. C5a is a chemotactic factor that attracts immune cells to the site of infection, while C5b initiates the formation of the MAC. Choices B, C, and D (C5b, C6, C7) are all components of the MAC and play crucial roles in the formation and function of the complex.