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

  • Residual Volume

  • Inspiratory Reserve Volume

  • Tidal Volume

  • Expiratory Reserve Volume

Answer

A.

Residual Volume

Volume of air present in lungs after forceful expiration as residual volume which prevents the collapsing of alveoli even after forceful expiration.

Volume of air present in lungs after forceful expiration as residual volume which prevents the collapsing of alveoli even after forceful expiration.