The alveoli of lungs are lined by:

Compound epithelium

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Squamous epithelium

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Cuboidal epithelium

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Columnar epithelium

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Solution

The correct option is B Squamous epithelium
Alveoli are the site of gas exchange in the lungs. Because rapid diffusion of gases is necessary between the capillaries and the alveoli, a very thin epithelial layer is needed. As a result, alveoli use simple squamous epithelium so that gases can easily diffuses to and from the bloodstream.

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