why are lungs divided into very small sac like structures

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Solution

Lungs are divided into small sac like structures called alveoli to increase the surface area for exchange of gases between lungs and blood.

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The small sac-like structures found inside the lungs where the blood vessels are wrapped tightly around are called as ___

The alveoli is a small sac-like structure present in the lungs that allows gas exchange.

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