Identify the respiratory volumes/capacities marked as a, b, c and d in the graph shown below:
A
VC, ERV, IC, EC
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B
ERV, VC, IC, EC
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C
ERV, IC, EC, VC
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D
IC, ERV, EC, IC
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Solution
The correct option is B ERV, VC, IC, EC Expiratory Capacity (EC): Total volume of air a person can expire after a normal inspiration. This includes tidal volume and expiratory reserve volume (TV+ERV).
Vital Capacity (VC): The maximum volume of air a person can breathe in after a forced expiration. This includes ERV, TV and IRV or the maximum volume of air a person can breathe out after a forced inspiration.
Inspiratory Capacity (IC): Total volume of air a person can inspire after a normal expiration.This includes tidal volume and inspiratory reserve volume (TV+IRV).
Expiratory Capacity (EC): Total volume of air a person can expire after a normal inspiration. This includes tidal volume and expiratory reserve volume (TV+ERV).