Cells of air sacs of the lungs comprise

Ciliated epithelium

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Glandular epithelium

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Columnar epithelium

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Squamous epithelium

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Solution

The correct option is D Squamous epithelium
Simple squamous epithelium lines air sac or alveoli. These squamous epithelial cells are permeable and allow the oxygen from the air to enter the blood in the capillaries of the lung,
So, the correct answer is option 'Squamous epithelium'.

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