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Complement Function

View the animation below, then complete the quiz to test your knowledge of the concept.






1Complement protein C3a
A)blocks phagocytosis.
B)attracts neutrophils to infection site.
C)increases permeability of blood vessels to neutrophils.
D)prevents bacteria from attaching to tissues.
E)breaks down viruses.



2The membrane attack complex consists of the following complement components:
A)one copy of each of C4b, C5, C6, C7, and C8, and multiple copies of C9.
B)one copy of each of C4b, C5, C6, and C7, and multiple copies of C8 and C9.
C)one copy of each of C5b, C6, and C7, and multiple copies of C8 and C9.
D)one copy of each of C5b, C6, C7, and C8, and multiple copies of C9.
E)one copy of each of C6, C7, C8, and C9, and multiple copies of C5b.



3Complement protein C5a
A)blocks phagocytosis.
B)attracts neutrophils to infection site.
C)increases permeability of blood vessels to phagocytes.
D)prevents bacteria from attaching to tissues.
E)breaks down viruses.



4Complement protein C3b is an opsonin which coats phagocytes and makes them more likely to find microbial cells.
A)True
B)False



5Complement proteins can be activated by the alternative pathway, classical pathway or lactose pathway.
A)True
B)False







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