Which of the following acts as a physical bar | vedclass

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(B) The human body has several lines of defense against pathogens. Physical barriers are the first line of defense. The skin and the mucus coating of

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Mucus coating

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(B) The human body has several lines of defense against pathogens. Physical barriers are the first line of defense. The skin and the mucus coating of the epithelium lining the respiratory,gastrointestinal,and urogenital tracts are the primary physical barriers. These barriers trap microorganisms and prevent their entry into the body. Therefore,the mucus coating acts as a physical barrier.

Which of the following acts as a physical barrier that prevents the entry of pathogens into the human body?

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