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

Expiratory Reserve Volume

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Residual Volume

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Inspiratory Reserve Volume

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Tidal Volume

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Solution

The correct option is B Residual Volume
The volume of air remaining in the lungs even after a forcible expiration is called residual volume. Thus, the correct answer is option B.

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When about 1500 ml of air remains in the lungs after forceful expiration, it is called the _________.

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