Talk:Tidal volume
Add topicLatest comment: 16 years ago by Cmcnicoll in topic Vt versus VC
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Vt versus VC
[edit]Difference between Tidal Volume and Vital Capacity?
- The tidal volume is the volume expired in a single breath in a resting person. The vital capacity includes the tidal volume, as well as the inspiratory reserve volume (IRV) and expiratory reserve volume (ERV). Think of the tidal volume as the air expired in a normal breath, while the vital capacity is the most air that could be breathed in and out if you tried. The ERV is the most air you can expire in excess of the tidal volume (your biggest exhalation). The IRV is the most air you can inspire above and beyond the normal tidal volume. Note that the vital capacity is not the total lung capacity, which is a value that inlcudes the lung's residual volume (RV). The RV is a volume that can never be expired, and thus is not included in the ERV. Cmcnicoll (talk) 07:30, 23 March 2010 (UTC)
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