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How does the body make it difficult for a pathogen to reach a part of the body that can cause disease

User CosminO
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I took this a while ago, however I believe that it is due to the semi-permeable layer that each cell has that only allows certain substances to pass through to the inner parts of the cell
User Pattermeister
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With multiple lines of defense including hair, defense mechanisms like sneezing, and various antigens
User XCrZx
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