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Lungs are made up of air-filled sacs, the alveoli. They do not collapse even after forceful expiration, because of:

1. Inspiratory Reserve Volume
2. Tidal Volume
3. Expiratory Reserve Volume
4. Residual Volume

Correct answer: Residual Volume

Solution

Residual volume is the air that remains in the lungs even after maximal forceful expiration. This leftover air helps maintain alveolar inflation, so the lungs do not collapse.

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