Question

question 39
which of the following cannot be measured by a spirometer?
a tidal volume
b residual volume
c inspiratory reserve volume
d expiratory reserve volume

Explanation:

A spirometer measures the volume of air that moves into and out of the lungs. Tidal volume (normal breathing volume), inspiratory reserve volume (extra air inhaled after normal breath), and expiratory reserve volume (extra air exhaled after normal breath) can be measured as they involve air movement. Residual volume is the air remaining in the lungs after maximum exhalation and cannot be measured by a spirometer as it doesn't involve air movement out of the lungs during the normal operation of a spirometer.

Answer:

B. Residual volume