Alveoli of lungs are lined by

Squamous epithelium

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Columnar epithelium

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Cuboidal epithelium

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Stratified cuboidal epithelium

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Solution

The correct option is A Squamous epithelium
The respiratory or gas-exchange surface consists of millions of small sacs, or alveoli, lined by a simple squamous epithelium. This epithelium is exceedingly thin to facilitate diffusion of oxygen and CO2. The alveolar walls also contain cuboidal surfactant-secreting cells. The surfactant overcomes the tendency of alveolar walls to adhere to one another (which would obliterate the air space).

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Alveoli of lungs are lined by _____________ epithelium:

Alveoli of lungs are lined by the _______ epithelium.

The alveoli are lined by simple squamous epithelium which is coated with a thin film of lecithin, a phospholipid. What purpose does this serve?

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