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Hi: in my Anatomy & Physiology II our teacher explained Pulmonary capacity as the sum of two or more primary lung volumes. There are five pulmonary capacities:

  1. Inspiratory Capacity (IC) IC= TV + IRV
  2. Expiratory Capacity (EC) EC= TV + ERV
  3. Functional Residual Capacity (FRC) FRC= ERV + RV
  4. Vital Capacity (VC) VC= IRV + TV + ERV
  5. Total Lung Capacity (TLC) TLC= IRV + TV + ERV + RV

TV = Tidal volume.

IRV= Inspiratory reserve volume.

ERV= Expiratory reserve volume.

RV =Residual volume.

Pulmonary volumes and capacities are measure, usually, when is suspected a respiratory disease because volumes and capacities changes with respiratory diseases.

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