Residual volume
Residual Volume
Residual volume (pronunciation: re-zid-yoo-al vol-yoom) is a term used in pulmonology to describe the amount of air left in the lungs after a maximal exhalation. This volume cannot be measured directly, but can be calculated using methods such as body plethysmography or using a gas dilution technique.
Etymology
The term "residual volume" comes from the Latin residuum, meaning "what remains", and the Latin volumen, meaning "a roll or scroll; a quantity or amount".
Definition
Residual volume is the volume of air still remaining in the lungs after the most forcible expiration possible, and it amounts on average to 1200 cubic centimeters, or about two pints. This volume cannot be expelled from the lungs; it is, therefore, the amount of air inhaled that is in addition to the residual volume.
Related Terms
- Tidal Volume: The amount of air which enters the lungs during normal inhalation at rest.
- Inspiratory Reserve Volume: The maximal amount of additional air that can be drawn into the lungs by determined effort after normal inspiration.
- Expiratory Reserve Volume: The maximal amount of additional air that can be exhaled by determined effort after normal exhalation.
- Vital Capacity: The total volume of air that can be exhaled after maximal inhalation.
- Total Lung Capacity: The total volume of the lungs when filled with as much air as possible.
See Also
External links
- Medical encyclopedia article on Residual volume
- Wikipedia's article - Residual volume
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