Which type of innate immunity barrier is repr | vedclass

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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 urogeni

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Physiological

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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: Certain types of leukocytes (WBCs) like $PMNL$-neutrophils,monocytes,and natural killer cells in the blood,as well as macrophages in tissues,phagocytose and destroy microbes. $4$. Cytokine barriers: Virus-infected cells secrete proteins called interferons,which protect non-infected cells from further viral infection. Therefore,saliva and tears are examples of physiological barriers.

Which type of innate immunity barrier is represented by the secretion of saliva from the mouth and tears from the eyes?

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