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(B) Innate immunity consists of four types of barriers:$1$. Physical barriers: These include the skin and the mucus coating of the epithelium lining t

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Physiological barrier

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(B) Innate immunity consists of four types of barriers:$1$. Physical barriers: These include the skin and the mucus coating of the epithelium lining the respiratory,gastrointestinal,and urogenital tracts.$2$. Physiological barriers: These include acid in the stomach,saliva in the mouth,and tears from the eyes,which prevent microbial growth.$3$. Cellular barriers: These include certain types of leukocytes $(WBC)$ like polymorpho-nuclear leukocytes $(PMNL)$,monocytes,and natural killer $(NK)$ cells in the blood,as well as macrophages in tissues.$4$. Cytokine barriers: These include virus-infected cells which secrete proteins called interferons that protect non-infected cells from further viral infection.Therefore,acid in the stomach,saliva in the mouth,and tears from the eyes belong to the physiological barrier.

Acid in the stomach,saliva in the mouth,and tears from the eyes all prevent microbial growth. These belong to which of the following barriers?

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