the walls of alveoli are extremely thin and moist for allowing faster ______ of gases.
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They have very thin walls for gases to be absorbed through. An individual air sac is called an alveolus. The layer of moisture in the alveoli allows gases to dissolve so that they can diffuse quickly. ... Thin lining: the lining of the alveoli is very thin so that gases can quickly diffuse through it.
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