2017 Breathing and Exchange of GasesRespiratory volumes – residual volume Easy Question 29 of 53 in Breathing and Exchange of Gases

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

A Residual Volume
B Inspiratory Reserve Volume
C Tidal Volume
D Expiratory Reserve Volume

The answer is A.

Solution

Residual volume keeps alveoli open.

The volume of air remaining in the lungs after forceful expiration is the residual volume, which prevents the alveoli from collapsing.

Concept residual-volume

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53 questions from this chapter have appeared across 20 exam years.