Skin is a:

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(A) The human immune system consists of various barriers that prevent the entry of pathogens. Skin is the primary physical barrier of the body. It pre

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Physical Barrier

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(A) The human immune system consists of various barriers that prevent the entry of pathogens. Skin is the primary physical barrier of the body. It prevents the entry of microorganisms by acting as a mechanical wall. Physiological barriers include acid in the stomach and saliva in the mouth. Cellular barriers include leukocytes like neutrophils and macrophages. Cytokine barriers include interferons secreted by virus-infected cells. Therefore,the correct option is $A$.

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