How many types of barriers are included in in | vedclass

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(D) Innate immunity is non-specific type of defense that is present at the time of birth. It consists of four types of barriers:$1$. Physical barriers

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Four

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(D) Innate immunity is non-specific type of defense that is present at the time of birth. It consists of four types of barriers:$1$. Physical barriers: e.g.,skin,mucus coating of the epithelium lining the respiratory,gastrointestinal,and urogenital tracts.$2$. Physiological barriers: e.g.,acid in the stomach,saliva in the mouth,and tears from eyes.$3$. Cellular barriers: e.g.,polymorpho-nuclear leukocytes ($PMNL$-neutrophils),monocytes,and natural killer cells in the blood,as well as macrophages in tissues.$4$. Cytokine barriers: e.g.,virus-infected cells secrete proteins called interferons which protect non-infected cells from further viral infection.

How many types of barriers are included in innate immunity?

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