Which of the following acts as a physical bar | vedclass

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(D) The innate immunity in humans consists of various barriers that prevent the entry of foreign agents into the body.Physical barriers include the sk

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Both $(A)$ and $(B)$

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(D) The innate immunity in humans consists of various barriers that prevent the entry of foreign agents into the body.Physical barriers include the skin and the mucus coating of the epithelium lining the respiratory,gastrointestinal,and urogenital tracts.The skin is the primary physical barrier that prevents the entry of microorganisms.The mucus membrane traps microorganisms entering our body.Saliva is a physiological barrier (chemical barrier) due to the presence of enzymes like lysozyme.Therefore,both skin and mucus membrane act as physical barriers.

Which of the following acts as a physical barrier to prevent the entry of microorganisms into our body?

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