Question

How is the lungs are designed in human being to maximize the x change of gases?

Answer 1

At the end of the bronchioles, the spherical sac like units are present are called 'alveoli'. here the exchange of gases takes place. There are millions of alveoli present so that a huge amount of gases exchange occur.

Answer 2

Within the lungs , the air passage

divides into smaller and smaller tubes

called bronchi which in turn form

bronchioles . The bronchioles terminate

in balloon-like structures called alveoli .

The alveoli present in the lungs provide

maximum surface for exchange of gases .

The alveoli have vary thin walls and

contain an extensive network of blood

vessels to facilitate exchange of gases .