Question

Mammalian lungs have an enormous number of minute aiveoli (air sacs). This is to allow

• A. more surface area for diffusion of gases
• B. more nerve supply to keep the the lungs working
• C. more space for increasing the volume of inspired air
• D. more spongy texture for keeping lung in proper shape

Answer 1

The correct option is A more surface area for diffusion of gases

ALveoli is a small sac-like structure that is responsible for the exchange of gases. They are the building material of the lungs and all the oxygen and carbon dioxide conversion take place in the alveoli. Mammalian lungs have a large number of minute alveoli because it increases the surface area for diffusion of gases and thus increases the efficiency of lungs.

So, the correct option is 'more surface area for diffusion of gases'