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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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The alveoli are the small ballon-like structures present in the lungs. The walls of the alveoli consist of extensive network of blood vessels. Each lung contains 300-350 million alveoli, making it a total of approximately 700 million in the both the lungs. The alveolar surface when spread out covers about `80 m^2` area. This large surface area makes the gaseous exchange mire efficient.
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