Lungs are made up of air-filled sacs, the alveoli. they do not collapse even after forceful expiration, because of
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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) Residual Volume (2) Inspiratory Reserve Volume (3) Tidal Volume (4) Expiratory Reserve Volume Out of NCERT Hint: Residual volume is the volume of air present in the lungs after forceful expiration.
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I think it is Residual volume
If this is correct Mark as brainliest
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