Class 11 Biology Breathing and Exchange of Gases Respiratory Volumes and Capacities

Respiratory Volumes and Capacities

  • Tidal Volume (TV): Volume of air inspired or expired during a normal respiration, which is approx. 500 mL.
  • Inspiratory Reserve Volume (IRV): Additional volume of air, a person can inspire by a forcible inspiration, which averages 2500 mL to 3000 mL.
  • Expiratory Reserve Volume (ERV ): Additional volume of air, a person can expire by a forcible expiration, which averages 1000 mL to 1100 mL.
  • Residual Volume (RV): Volume of air remaining in the lungs even after a forcible expiration, which averages 1100 mL to 1200 mL.
  • Inspiratory Capacity (IC): Total volume of air a person can inspire after a normal expiration, which includes tidal volume and inspiratory reserve volume ( TV+IRV).
  • Expiratory Capacity (EC): Total volume of air a person can expire after a normal inspiration, which includes tidal volume and expiratory reserve volume (TV+ERV).
  • Functional Residual Capacity (FRC): Volume of air that will remain in the lungs after a normal expiration, which includes ERV+RV.
  • Vital Capacity (VC): The maximum volume of air a person can breathe in after a forced expiration, which includes ERV, TV and IRV.
  • Total Lung Capacity: Total volume of air accommodated in the lungs at the end of a forced inspiration, which includes RV, ERV, TV and IRV.

Class_11_Biology_Breathing_Exchange_of_Gases_Spirometer

Fig. Respiratory volumes

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