What is vital capacity of our lungs?

Inspiratory reserve volume plus expiratory reserve volume

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Total lung capacity minus residual volume

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Inspiratory reserve volume plus tidal volume

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Total lung capacity minus expiratory reserve volume

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Solution

The correct option is B Total lung capacity minus residual volume
Vital capacity is the maximum volume of air a person can inspire after a forced expiration or the maximum volume of air a person can breathe out after a forced inspiration. It is calculated as the sum total of inspiratory reserve volume (IRV), tidal volume (TV), and expiratory reserve volume (ERV), i.e., VC = IRV+TV+ERV. Total lung capacity (TLC) is the sum of vital capacity and residual volume (RV), i.e., TLC = VC+RV. Thus, vital capacity can also be calculated as total lung capacity minus residual volume.

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