Secretory IgA act protects the mucous membranes by:
A. Acting as an opsonin (a substance that mark the target for phagocytosis)
B. Activating the helper T-cells
C. Interfering with the adherence of the microbe to the mucous membrane
D. Killing the invading microbe
Ans: C. Interfering with the adherence of the microbe to the mucous membrane
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