All of the following can be measured by a simple spirometer except.
Correct Answer: Residual volume
Description: Ans. is 'c' i.e. Residual volume Residual volume (which is the amount of air remaining in the lungs at the end of forced expiration) cannot be measured by simple spirometer because the air in the residual volume of lungs cannot be expired into the spirometer. To measure residual volume, spirometer is used in a special way - by means of helium dilution method*.
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