Lung volumes
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Lung Volumes
Lung volumes (pronunciation: lʌŋ ˈvɒljʊmz) refer to the different volumes associated with the different phases of the respiratory cycle. They are typically measured by spirometry, a common pulmonary function test.
Etymology
The term "lung volumes" is derived from the Latin word "lung" meaning "light", and the Latin word "volumen" meaning "roll, scroll, or volume".
Definitions
There are four primary lung volumes:
- Tidal Volume (TV): The amount of air inhaled or exhaled during normal breathing.
- Inspiratory Reserve Volume (IRV): The maximum amount of air that can be inhaled after a normal inhalation.
- Expiratory Reserve Volume (ERV): The maximum amount of air that can be exhaled after a normal exhalation.
- Residual Volume (RV): The amount of air remaining in the lungs after a maximal exhalation.
Related Terms
- Lung Capacities: These are derived from the lung volumes and include the Vital Capacity (VC), Inspiratory Capacity (IC), Functional Residual Capacity (FRC), and Total Lung Capacity (TLC).
- Spirometry: This is a common pulmonary function test that measures lung volumes and capacities.
- Pulmonary Function Test (PFT): This is a set of tests that measure how well the lungs work, including lung volumes and capacities.
See Also
External links
- Medical encyclopedia article on Lung volumes
- Wikipedia's article - Lung volumes
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