Komal D. answered • 12/26/20
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The residual volume cannot be controlled . The residual volume is that the volume of air that is remains in the lungs as after the maximal exhalation .
The normal residual volume is 120 ml or we can say about 20-25 ml/kg . However the lung volume is measured by the spirometry .
But residual volume is indirectly measured by the summation of Functional residual capacity (FRC) and Expiratory residual volume (ERV) and cannot be measured by the spirometry .
RV = FRC + ERV
FRC = It is the amount of air that is remaining in the lung at the end of a normal exhalation . and it is about 1800-2200 ml
ERV= It is the amount of air that can be exhaled by the person forcibly after the normal exhalation . It is about 700 - 1200 ml
