Alveoli of lungs are lined by the _______ epithelium.

squamous

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cuboidal

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columnar

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transitional

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Solution

The correct option is A
squamous

Squamous epithelium is made of a thin layer of flattened cells with irregular boundaries. The nucleus is found in the upper surface of cell membrane giving an embossed look. It is abundantly present in the blood vessels, alveoli of lungs, intestine etc. Squamous epithelial cells in the alveoli allow oxygen from the air to enter the blood in the capillaries of the lung. Carbon dioxide, a waste product, passes across the epithelium of the alveoli to be removed from the body.

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Similar questions

	I		II
(a)	Simple squamous epithelium	(i)	Ureters
(b)	Simple cuboidal epithelium	(ii)	Epididymis
(c)	Nonciliated simple columnar epithelium	(iii)	Lining of alveoli of lungs
(d)	Transitional epithelium	(iv)	Lining of thyroid vesicles
(e)	Pseudostratified nonciliated columnar epithelium	(v)	Mucosa of stomach and intestine

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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