Question

What is meant by residual volume of air? What is its function?

Answer 1

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=> The residual volume of air is the minimum volume of air which is present in the lungs during the breathing cycle when air is taken in and let out of the lungs.

This ensure that there is sufficient time for O2 to be absorbed and for the CO2 to be released.

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Answer 2

Residual Volume Definition. ... As shown, the RV isthe difference between the functional residualcapacity, which is the amount of air left in the lungs after a natural exhalation, and the expiratory reservevolume, which is the maximum amount of air a person can still let out after natural exhalation.