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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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There are millions of thin walled air sacs called alveoli in the lungs. The presence of these alveoli provides a large area for exchange of gases the availability of large surface area maximises the exchange of gases for example if all the alveoli from two human beings are unfolded they would give an area of about 80 square metres.
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