Explain the respiratory volumes and capacities.

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Solution

Capacity Definition Equivalent value
Inspiratory Capacity The total volume of air a person can inspire after a normal expiration. TV+IRV
Expiratory Capacity The total volume of air a person can expire after a normal inspiration. TV+ERV
Functional Residual Capacity The volume of air that will remain in the lungs after a normal expiration. ERV+RV
Vital Capacity The maximum volume of air a person can breathe in after a forced expiration. ERV+TV+IRV
Total Lung Capacity The total volume of air accommodated in the lungs at the end of a forced inspiration RV+ERV+TV+IRV
Respiratory Volume
Volume Definition Approx value
Tidal Volume The volume of air inspired or expired during a normal respiration 6000-8000 ml of air per minute.
Inspiratory Reserve Volume The additional volume of air, a person can inspire by a forcible inspiration. 2500-3000 ml
Expiratory reserve volume The additional volume of air, a person can expire by a forcible expiration. 1000-1100 ml
Residual Volume The volume of air maintaining in the lungs even after a forcible expiration. 1000-1200 ml

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