The physical barriers that are part of the immune system function by having ______. a. mucus that traps pathogens and other foreign substances b. None of the answers are correct. c. All of the answers are correct. d. tightly packed epithelial cells that prevent pathogens from entering tissues e. cilia that sweep mucus out of the throat
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Step 1: The physical barriers in the immune system include mucus that traps pathogens and other foreign substances, tightly packed epithelial cells that prevent pathogens from entering tissues, and cilia that sweep mucus out of the throat. Show more…
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