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The Physical Barriers That Are Part of the Immune System

Question 77

Multiple Choice

The physical barriers that are part of the immune system function by having _________.


A) tightly packed epithelial cells that prevent pathogens from entering tissues
B) mucus that traps pathogens and other foreign substances
C) cilia that sweep mucus out of the throat
D) All of the answers are correct.
E) None of the answers are correct.

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