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Why are the digestive and respiratory systems the main sites of entry for pathogens? |
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Why are the digestive and respiratory systems the main sites of entry for pathogens? -
12-30-2008, 10:31 PM
Why are the respiratory and digestive systems the main sites of entry for pathogens?
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02-09-2009, 10:49 AM
These surfaces are not covered by a waterproof barrier like the skin. Also, the surfaces of the respiratory tract and GI tract have huge surface areas (the alveoli in the lungs, and the microvilli in the GI tract). This allows for lots of places for pathogens to attach and gain entry into the body.
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