Why are alveoli so small and uncountable in number? (OR) How do alve

1.	Why are alveoli so small and uncountable in number? (OR) How do alveoli increase the area for exchange of gases?
Answer» 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.

Why are alveoli so small and uncountable in number? (OR) How do alveoli increase the area for exchange of gases?

Answer»

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.

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Why are alveoli so small and uncountable in number? (OR) How do alveoli increase the area for exchange of gases?

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