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In the lungs, the oxygen passes from the alveoli to the blood. What features make this process rapid?

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In the lungs, the oxygen passes from the alveoli to the blood. What features make this process rapid?

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Ans:Oxygen moves from the alveoli through the alveoli membrane into the blood by passive diffusion. This does not require energy. The amount of oxygen on the two sides (blood and air) makes diffusion rapid.

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