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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 alevoli are the small balloon like structure present in the lungs: The walls of the alveoli consist ofextensive network of blood vessels. Each lung containes 300-350 million alevoli, making it a total of approximately, 700 million in both the lungs. The alevolia surface when spread out covers about 80 `m^2` area. The large surface area makes the gaseous exchange more efficient.
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