Which barrier of innate immunity is represent | vedclass

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(B) 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 barrier

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(B) 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. $4$. 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 barrier of innate immunity is represented by saliva in the mouth and tears in the eyes?

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