Complement System Quiz

What role does C3a play in the complement system?

• It tags pathogens for destruction.

• It acts as a chemical attractant for phagocytes.

• It forms the membrane attack complex.

• It splits C5 into C5a and C5b.

Which proteins form the membrane attack complex?

• Factors P, B, and D

• C5b, C6, C7, C8, and C9

• C3a and C3b

• C1, C2, and C4

What is the function of the membrane attack complex?

• To split C3 into C3a and C3b

• To create a hole in the pathogen's membrane

• To tag pathogens for destruction

• To attract phagocytes to the site of infection

How does the alternate pathway of the complement system begin?

• With C3 binding directly to the pathogen

• With the splitting of C5 into C5a and C5b

• With the formation of C3 convertase

• With the activation of C1

Which factors are involved in the alternate pathway of the complement system?

• C1, C2, and C4

• C5b, C6, C7, C8, and C9

• Factors P, B, and D

• C3a and C3b