5. All of the following are physical barriers against invading pathogens except a. Macrophages. b. Mucous membranes. c. Saliva. d. Skin.
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Macrophages are a type of white blood cell that engulfs and digests cellular debris, foreign substances, microbes, cancer cells, and anything else that does not have the types of proteins specific to healthy body cells on its surface in a process called Show more…
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