Lungs are made up of air-filled sacs, the alveoli. They do not collapse even after forceful expiration, because of:
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
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The correct answer is (4)
Volume of air present in lungs after forceful expiration as residual volume prevents the collapsing of alveoli.
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