A spirometer cannot be used to measure which | vedclass

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(B) spirometer is an instrument used to measure the volume of air inspired and expired by the lungs.It can measure tidal volume $(TV)$,inspiratory res

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$RV$

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(B) spirometer is an instrument used to measure the volume of air inspired and expired by the lungs.It can measure tidal volume $(TV)$,inspiratory reserve volume $(IRV)$,and expiratory reserve volume $(ERV)$.It can also measure capacities derived from these,such as inspiratory capacity $(IC = TV + IRV)$.However,it cannot measure residual volume $(RV)$,which is the volume of air remaining in the lungs even after a forcible expiration.Since $RV$ cannot be exhaled,it cannot be measured by direct spirometry.

$A$ spirometer cannot be used to measure which of the following?

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