Question

Why alveoli are so small and uncountable in number?

Answer 1

hey mate...

here is your answer...

Alveoli are so small and they are uncountable in number in order to increase the exchanges of gases in the lungs. They are too small so that number of alveolus can fit in it and increase the exchange of gases.

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Answer 2

1) The pouch-like air sacs at the ends of the smallest branchioles are called alveoli.

2) The walls of the alveolus are very thin and they are surrounded by very thin blood

capillaries.

3) It is in the alveoli that gaseous exchange takes place.

4) There are millions of alveoli in the lungs. The presence of millions of alveoli in the lungs provides a very large area for the exchange of gases.

5) And the availability of large surface area maximises the exchanges of gases.