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Respiratory Volumes and Capacities

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Estimated time: 3 minutes
CBSE: Class 12

Key Points: Respiratory Volumes and Capacities

  • Tidal Volume (TV) - Volume of air inhaled or exhaled during normal breathing - 500 mL.
  • Inspiratory Reserve Volume (IRV) - Extra air inhaled by forceful inspiration - 2500 to 3000 mL.
  • Expiratory Reserve Volume (ERV) - Extra air exhaled by forceful expiration - 1000 to 1100 mL.
  • Residual Volume (RV) - Air remaining in lungs even after forceful expiration - 1100 to 1200 mL.
  • Inspiratory Capacity (IC) = TV + IRV, Expiratory Capacity (EC) = TV + ERV, Functional Residual Capacity (FRC) = ERV + RV (AIPMT 2010)
  • Vital Capacity (VC) = ERV + TV + IRV - Maximum air inhaled after forced expiration or exhaled after forced inspiration.
  • Total Lung Capacity (TLC) = RV + ERV + TV + IRV = VC + RV - Total air in lungs after forced inspiration.

Shaalaa.com | Breathing and Exchange of Gases part 9 (Respiratory Volumes)

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Breathing and Exchange of Gases part 9 (Respiratory Volumes) [00:08:02]
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