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(C) Innate immunity consists of four types of barriers that prevent the entry of foreign agents into our body.$1$. Physical barriers: Skin and mucus c

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Cellular barrier

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(C) Innate immunity consists of four types of barriers that prevent the entry of foreign agents into our body.$1$. 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: Polymorpho-nuclear leukocytes $(PMNL-neutrophils)$,monocytes,and lymphocytes like natural killer cells in the blood,as well as macrophages in tissues,phagocytose and destroy microbes.$4$. Cytokine barriers: Virus-infected cells secrete proteins called interferons which protect non-infected cells from further viral infection.Since $WBC$ (White Blood Cells) like neutrophils and macrophages are involved in phagocytosis,they represent the cellular barrier.

$WBC$ is an example of

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