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The first line of immune defense is the skin and mucus membranes. Skin acts as a physical barrior, blocking pathogens from entering. Mucus wihin the nasal cavity blocks some of the pathogens from entering the body. Cilia also aid in protectiong by acting as a barrior as well. There is also mucus lining the bronchial tubes, which like other mucus, blocks pathogens.

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12y ago
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9y ago

The skin

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12y ago

Skin

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Q: How do body's barriers protect the body against pathogens?
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Barriers, The Inflammation Process, and Antibodies.


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