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What are the 4 barriers that keep humans healthy against pathogens?
Wiki User
∙ 9y ago
Four barriers that protect humans from pathogens include the mucus of the upper respiratory system, the acid mantle of the skin, the stomach acid in the digestive system, and the cervical mucus of the female reproductive system. There are also celular barriers via the immune system that prevent infection.
Wiki User
∙ 8y ago
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