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Asked by Sohna

The average number of alveoli in each human lung is 280 million. The average surface area of 1 million alveoli is 0.25 m2?

Your question seems a little vague, could you expand on it a bit? If you are questioning how all of the alveoli fit in our lungs then I can answer that. The alveolus’ shape is such that it can drastically increase its surface area without taking up that much volume in your lungs (through bulges and lumps on their surface) allowing them to have a big surface area in a small volume.

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Robert Hartley
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