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Question

Which one of the following forms the second line of defense of the body against pathogens?

A
Tears
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B
Skin
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C
Mucus
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D
WBCs
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Solution

The correct option is D WBCs
WBCs acts as the second level of defense in human body. Skin, tears and mucus form the first line of defense of the body against microbial invasion. The body has a system to destroy germs when they enter it by overcoming the immune system. The wounds and cuts in the skin may cause infection. Second level defense are activities to destroy the germs in such situations.

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