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(A) The human body has innate immunity consisting of four types of barriers:$1$. Physical barriers: Skin and mucus coating of the respiratory,gastroin

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Polymorphonuclear leukocytes $(PMNL)$ and monocytes - Cellular barrier

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(A) The human body has innate immunity consisting 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 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.Option $A$ is correct because $PMNL$ and monocytes are examples of cellular barriers.Option $B$ is incorrect because these are examples of passive immunity (pre-formed antibodies).Option $C$ is incorrect because saliva and tears are physiological barriers,not physical.Option $D$ is incorrect because mucus coating is a physical barrier,while $HCl$ is a physiological barrier.

Select the option that correctly matches the example with its specific type of immunity barrier.

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