Why are there lots of alveoli in the lungs?

1 Answer
Cameron G.
Jul 6, 2016

They increase the surface area which increases the rate of gas exchange.

Explanation:

Alveoli hugely increase the surface area of the lungs. This increases the area over which gas exchange can occur, which in turn increases the rate of gas exchange. This allows the rate of oxygen diffusion into the blood to be large enough to supply the body with oxygen.

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