Question

Define residual volume and stare its importance

Answer 1

Residual Volume Definition. Residual volume is the amount of air that remains in a person's lungs after maximum exhalation. The vertical axis indicates volume and the horizontal axis indicates time.

Answer 2

Residual Volume is the amount of gas remaining in the lungs at the end of a maximum exhalation.
Residual Volume is important because it prevents the lungs from collapsing.
Even after we have expelled as much air as possible (expiratory reserve volume) gaseous exchange is still occurring by residual volume in the lungs.
It also prevents the inner surfaces of the lungs sticking together.

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