MediumZoologyBreathing and Exchange of Gases
+4 / -1
Which of the following lung volumes CANNOT be measured directly by a spirometer?
A
Tidal volume
B
Inspiratory reserve volume
C
Residual volume
D
Expiratory reserve volume
Explanation
Residual Volume (RV) is the volume of air (about 1.1–1.2 L) remaining in the lungs even after maximum forced expiration. It cannot be measured directly by a spirometer because you cannot exhale it. It is measured indirectly by gas dilution techniques (helium dilution) or body plethysmography. TV, IRV, and ERV can all be directly measured by spirometry.
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