肺容量/肺容積Pulmonary volumes & capacities

Pulmonary volumes & capacities

    ■Lung volume: Are discrete values & No one volume includes another volume

     1.tidal volume (TV): (about 0.5 liter)

        the volume of air inhaled & exhaled during single expiratory cycle at rest

     2.expiratory reserve volume (ERV): (1.5 liter)

        the volume of air that can be forcibly exhaled following a quiet exhalation

     3.inspiratory reserve volume (IRV): (about 2.0 liters)

        the volume of air that can be inhaled beyond that inhaled in tidal volume

     4.residual volume (RV) : (1.0 liters)

       the volume of air remaining in the lungs after maximum exhalation 

     ■ Lung capacities: Include two or more lung volumes

     1.vital capacity (VC): IRV+TV+ERV

        -forced expiratory volume in 1 second (FEV1)

     2.inspiratory capacity (IC): IRV+TV

     3.functional residual capacity (FRC):ERV+RV

        the volume of air in the lungs at resting expiratory level

    4.total lung capacity (TLC): IRV+TV+ERV+RV

       the volume of air lung capable of holding at maximum inhalation

    ■REL(resting expiratory level): or end-expiratory level a reference point 35% VC

picture resource: http://academic.pgcc.edu/AandP/Bio206/Images/Exercise10/LungVolumes.jpg

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