Discussion
Minute ventilation (VE) = ............. × Respiratory frequency (f).
Answer: C
Minute ventilation equals tidal volume × respiratory frequency.
\[ V_E = V_T \times f \]
Tidal volume is the volume of air breathed in or out in one normal breath, about 0.5 L at rest. At 12 breaths per minute that gives about 6 L/min, rising to over 100 L/min in heavy exercise as both depth and rate of breathing increase.
The inspiratory and expiratory reserve volumes are the extra volumes that can be forced in or out beyond a normal breath, and vital capacity is the largest single breath. None of them is the volume moved with each ordinary breath.
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