Question

Mammalian lungs have numerous alveoli for

• A. Increasing surface area for gaseous diffusion
• B. Keeping the lungs in proper shape
• C. Higher number of muscles to provide greater elasticity
• D. Increasing volume of inspired air

Answer 1

The correct option is A Increasing surface area for gaseous diffusion

Role of alveoli
Alveoli are the regions of the respiratory system where exchange of gases takes place. They are adapted for this function as:-
$\bullet$ Numerous number resulting in an increase in the surface area for gas exchange.
$\bullet$ One cell thin layer surrounding them
$\bullet$ Rich supply of blood capillaries