Alveolus of lungs is lined by . . . . . . .

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(A) The alveoli of the lungs are the primary sites of gaseous exchange. To facilitate efficient diffusion of gases ($O_2$ and $CO_2$),the wall of the

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Squamous epithelium

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(A) The alveoli of the lungs are the primary sites of gaseous exchange. To facilitate efficient diffusion of gases ($O_2$ and $CO_2$),the wall of the alveoli must be extremely thin. This is achieved by a single layer of flat,scale-like cells known as simple squamous epithelium. Therefore,the alveolus of the lungs is lined by squamous epithelium.

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