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(C) Innate immunity consists of four types of barriers:$1$. Physical barriers: Skin and mucus coating of the respiratory,gastrointestinal,and urogenit

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Physiological barrier

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(C) Innate immunity consists of four types of barriers:$1$. Physical barriers: Skin and mucus coating of the respiratory,gastrointestinal,and urogenital tracts.$2$. Physiological barriers: Acid in the stomach,saliva in the mouth,and tears from the eyes prevent microbial growth.$3$. Cellular barriers: Polymorphonuclear leukocytes ($PMNL$-neutrophils),monocytes,and natural killer cells in the blood,as well as macrophages in tissues.$4$. Cytokine barriers: Virus-infected cells secrete proteins called interferons which protect non-infected cells from further viral infection.Therefore,saliva and tears are classified as physiological barriers.

Which type of barrier includes the various barriers of innate immunity such as saliva in the mouth and tears from the eyes?

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