what is walls of alveoli?
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Pulmonary alveolus, plural pulmonary alveoli, any of the small air spaces in the lungs where carbon dioxide leaves the blood and oxygen enters it. ... The wall of each alveolus, lined by thin flat cells (Type I cells) and containing numerous capillaries, is the site of gas exchange, which occurs by diffusion.
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The over roll surface of the alveolar wall comprises an area of 50 to 100 m^2 about as large as a tennis court and 50 times larger than the body surface
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