Gayathri had learned about immune system in class. She wondered if any part of the immune system is visible to our naked eyes. Help her identify these components.

Skin

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Monocyte

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Hydrochloric acid

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Ear wax

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Solution

The correct options are
A Skin
D Ear wax
Our first level defense consists of components such as skin, mucus and ear wax. Hydrochloric acid in the stomach also fights against germs but since this is inside the body, it is not visible to the eye. Monocyte is a WBC which is a part of second level defense.

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