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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Physical

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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 barriers	$(1)$ Interferon
$(B)$ Physiological barriers	$(2)$ Leukocytes
$(C)$ Cellular barriers	$(3)$ Tears
$(D)$ Cytokine barriers	$(4)$ Skin

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Match the following columns:

Column-$I$ Column-$II$

$(A)$ Physical barriers $(1)$ Interferon

$(B)$ Physiological barriers $(2)$ Leukocytes

$(C)$ Cellular barriers $(3)$ Tears

$(D)$ Cytokine barriers $(4)$ Skin

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