Biology...defenses of the body against bacteria, diseases...etc.
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The skin provides the first defense against invasion by pathogens. Skin acts as a wall that keeps pathogens out of the body. Secretions of the oil and sweat glands within the dermis make the skin's surface very acidic, inhibiting the growth of many pathogens. Sweat also contains the enzyme lysozyme, which attacks and digests the cell walls of many bacteria.
Internal surfaces of the body though which pathogens could pass are covered by mucous membranes, epithelial layers that produce the sticky fluid called mucus. Mucous membranes line the digestive system, nasal passages, lungs, res…
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