Question

Mammalian lungs have numerous alveoli for.

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

Answer 1

The correct option is D Increasing surface area for gaseous diffusion

• The number of alveoli in the human lungs has been estimated to be approximately 300 million.
  
• This enormous number of alveoli are meant to increase surface area of lungs for diffusion of gases. Hence, Option D is correct.