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Answer -
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.
It represent the maximum amount of air one can renew in the respiratory system in a single respiration. Thus, greater the vital capacity more is the energy available to the body for doing strenous work. Vital capacity is higher in athletes and mountain dwellers. Young persons would possess more vital capacity as compared to children or older persons.