Physiology 3120 Lecture Notes - Lecture 3: Tidal Volume, Lung Volumes, Spirometry
20 Jan 2017
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Old fashion: inhalation liquid goes down (pen goes up) Exhalation liquid goes up (pen goes down) Tidal volume: volume of air inhaled with each breath. Minute volume or pulmonary ventilation: volume of air inhaled per minute: calculation: tidal volume x frequency of respiration, example: tidal volume = 500ml. Vital capacity: volume of air that can be forcibly exhaled after the maximal inspiration: inspiratory capacity + expiratory capacity. Inspiratory reserve volume (irv): volume of air that can be forcible inhaled following a normal inspiration. Expiratory reserve volume (erv): volume of air that can be forcibly exhaled following a normal exhalation: during exercise both inspiratory and expiratory reserve volume decreases. Residual volume (rv): volume of air remaining in the lungs after a maximal expiration: still have air in your lungs to prevent lungs from collapsing. Functional residual capacity (frc): volume of air remaining in the lungs at the: can"t measure using spirometer end of a normal expiration, expiratory capacity + residual volume.
