How far is the structure of alveoli suitable for the exchange of gases
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Answer: Alveolar walls are one-cell thick, to shorten diffusion distance. They have a balloon-like structure to maximise surface area to volume ratio for the exchange of gases. They are richly supplied with blood vessels to facilitate the exchange of gases. The blood is continuously flowing so that diffusion also continues.
Explanation:
the walls are only one cell thick, so the distance between the alveolus and the blood is the shortest it can be, so diffusion is allowed to happen at a faster rate.
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