Surface barriers,such as cutaneous and mucous membranes,serve the immune system as the:
A)first line of defense.
B)second line of defense.
C)third line of defense.
D)fourth line of defense.

Question

Quizplus · Accepted Answer

Surface barriers, including cutaneous and mucous membranes, are the first line of defense for the immune system. They physically block the entry of pathogens and produce various secretions that inhibit their growth and spread. This is the body's first attempt at protecting itself from potential threats.

Surface Barriers,such as Cutaneous and Mucous Membranes,serve the Immune System