What type of barrier is the mucus membrane?

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(A) The human body has innate immunity which consists of four types of barriers: $1$. Physical barriers: Skin and mucus coating of the epithelium lini

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(A) The human body has innate immunity which consists of four types of barriers: $1$. Physical barriers: Skin and mucus coating of the epithelium lining the respiratory,gastrointestinal,and urogenital tracts. $2$. Physiological barriers: Acid in the stomach,saliva in the mouth,and tears from eyes. $3$. 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,the mucus membrane acts as a physical barrier.

Column-$I$	Column-$II$
$(a)$ Physical barrier	$(w)$ Saliva
$(b)$ Physiological barrier	$(x)$ Interferons
$(c)$ Cellular barrier	$(y)$ Skin
$(d)$ Cytokine barrier	$(z)$ Monocytes

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