Question

significance of residual volume of air in lungs

Answer 1

The residual volume (RV) is the amount of air that is left after expiratory reserve volume is exhaled. The lungs are never completely empty. There is always some air left in thelungs after a maximal exhalation. ...Residual volume is also important for preventing large fluctuations in respiratory gases (O2 and CO2)

Answer 2

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During the breathing cycle, when air is taken in and let out, the lungs always contain a residual volume of air so that there is sufficient time for oxygen to be absorbed and for the carbondioxide to be released.

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