Question

why their are many alveoli in lungs? give reason !

Answer 1

Hey there!

In lungs, balloon-like structure called Alveoli are present to provide maximum surface area for the exchange of gases. The alveoli have very thin walls and contain an extensive network of blood vessels to facilitate the exchange of gases.

The bronchus, within the lungs, divide into smaller tubes (bronchioles) and finally terminate in Alveoli. The alveoli is made of of thin moist membranes which are richly supplied with blood and provide a very large surface area for the Exchange of gases.


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Answer 2

We have so many alveoli because it increases the surface area in the lungs for gaseous exchange. We need a lot of oxygen in order to respire at an efficient enough metabolic rate.
Not only does that mean we take in a decent amount of oxygen needed. But it also means we can transfer carbon dioxide out of the body at an efficient enough rate so that it doesn't build up in our blood.
Just think about how much more oxygen you take in when you breathe properly.
It's important that we have enough surfaces of exchange to allow sufficient amounts of oxygen in and carbon dioxide out or we'd all be out of breath constantly as well as have weak muscles due to oxygen deprivation.