Multiple choice

Why do mammalian lungs have numerous alveoli?

  1. For increasing volume of inspired air

  2. For keeping the lungs in proper shape and position

  3. For higher number of muscles to provide greater elasticity

  4. For increasing the surface area for gaseous diffusio<font size="2">n</font>

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D Correct answer
Explanation

Mammalian lungs have numerous alveoli for increasing the surface area for gaseous diffusion.

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