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Unformatted text preview: LUNG VOLUMES AND PULMONARY FUNCTION TESTS: Pulmonary function can be examined by the spirometry technique . Spirometers are the traditional tools of the respiratory physiologists. The subject breathes into a closed system in which air is trapped (bell). As the subject breathes air movement into or out of the mouthpiece causes the bell to rise (inspiration) or fall (expiration). Corresponding movements of an attached pen register the change in volume on a rotating drum recorder. From such a recording we could measure Tidal volume (TV): Volume of air inhaled or exhaled with each breath during normal breathing (0.5 L). Inspiratory reserve volume (IRV): Maximal volume of air inhaled at the end of a normal inspiration (3 L) Expiratory reserve volume Inspiratory capacity (IC): Maximal volume of air inhaled after a normal expiration (3.6 L) (TV+IRV) Functional Residual Capacity (FRC): The volume of gas that remains in the lung at the end of a passive expiration. (2-2.5 L or 40 % of the maximal lung volume) (ERV+RV).passive expiration....
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