The surface area of the lungs is increased by

chest

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ribs

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air sacs

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diaphragm

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Solution

The correct option is C
air sacs

The correct option is (C).
Explanation for the correct option:
Air sacs known as alveoli are present within the lungs.
Alveoli increase the diffusion of gases between the lungs and the blood by enhancing the lung surface area.
Explanation for the incorrect options:
Option (A)
The chest does not increase the surface area.
Option (B)
The rib is responsible for the expansion of the lungs.
Option (D)
The diaphragm is an essential respiratory muscle that helps in the expansion and contraction of the lungs.
The air sacs increase the surface area of the lungs.

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