Assertion (A): Alveoli of the lungs are lined by epithelial cells.
Reason (R): Gas exchange occurs in the lungs.

Both A and R are correct and R is the correct explanation of A.

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Both A and R are correct, but R is not the correct explanation of A.

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A is correct but R is incorrect.

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A is incorrect but R is correct.

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Solution

The correct option is A Both A and R are correct and R is the correct explanation of A.
Different types of epithelial cells are present in different parts of the body and they have different functions. Stratified epithelium present in the skin are protective in nature and squamous epithelium present in the alveoli is very thin and helps in gas exchange. It helps in the absorption of oxygen into the blood stream from the lungs and removes carbon dioxide.

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