Which of the following is mismatched?

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(C) The correct answer is $C$. $1$. Physical barriers include skin and mucus coating of the respiratory,gastrointestinal,and urogenital tracts. $2$. P

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Cellular barrier – Tears from the eyes

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(C) The correct answer is $C$. $1$. Physical barriers include skin and mucus coating of the respiratory,gastrointestinal,and urogenital tracts. $2$. Physiological barriers include acid in the stomach,saliva in the mouth,and tears from the eyes. $3$. Cellular barriers include polymorphonuclear leukocytes ($PMNL$-neutrophils),monocytes,and natural killer cells. $4$. Cytokine barriers include proteins called interferons which protect non-infected cells from further viral infection. Therefore,'Cellular barrier – Tears from the eyes' is mismatched because tears are a physiological barrier,not a cellular one.

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