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How are the alveoli designed to maximise...

How are the alveoli designed to maximise the exchange of gases?

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Alveoli are small pouches or sac like structure They are surrounded by blood capillaries. Thus a large amount of area brought in contact with the air in the lungs. The presence of millions of alveoli in the lungs provides a very large surface area for the exchange of gases. The availability of large surface area maximises the exchange of gases.
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