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How are alveoli designed to maximise the...

How are alveoli designed to maximise the exchange of gases ?

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The human lungs have been designed to maximise the exchange of gases as follows .
(1)There are millions of alveoli in the lungs.
(2)The presence of millions of alveoli in the lungs provide a very large area for the exchange of gases.
(3)Availability of large surface area maximises the exchange of gases.
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