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Lung volumes |
Also found in: Dictionary/thesaurus, Encyclopedia, Wikipedia, Hutchinson | 0.03 sec. |
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lung volumes Physiology A group of air 'compartments' into which the lung may be functionally divided
Lung volumes
Expiratory reserve capacity–ERV The maximum volume of air that can be voluntarily exhaled
Functional residual capacity (FRV) Volume left in the lungs at the end of a normal breath which is not normally part of the subdivisions
Inspiratory capacity–IC The maximum volume that can be inhaled
Inspiratory Reserve capacity–IRC The maximum volume that can be inhaled above the tidal volume
Tidal volume–VT The normal to-and-fro respiratory exchange of 500 cc; vital capacity is the maximum amount of exhalable air; after a full inspiration, which added to the residual volume, is the total lung capacity
Total lung capacity–TLC The entire volume of the lung, circa 5 liters
Vital capacity–VC The maximum volume that can be inhaled and exhaled
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A middle range for background pressure was selected because, although the volume of inspired air during spontaneous breathing has been shown to be higher during high background pressure than during low background pressure, high background pressure is known to lower end-expiratory lung volume (EELV) more than low background pressure for the same oscillation frequency. By 7 years of age, a 13-fold increase in lung volume has taken place (11), and in adult lungs, individual alveoli number some 200-600 million. The lung volume of children in smoggy neighborhoods grew significantly less than that of their peers in less-polluted communities, a new University of Southern California study shows. |
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