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What is the vital capacity of our lungs?

  • Inspiratory reserve volume plus tidal volume

  • Total lung capacity minus expiratory reserve volume

  • Inspiratory reserve volume plus expiratory reserve volume

  • Total lung capacity minus residual volume

Answer

D.

Total lung capacity minus residual volume

Vital capacity is the sum of inspiratory reserve volume, tidal volume and expiratory reserve volume. It is about 4800 mL.

Total lung capacity is the sum of vital capacity and residual volume, ie, vital capacity minus residual volume.

Tidal volume is the amount of air, which normally passes into and out of the lungs during each cycle of quite breathing. It is about 800 mL in an adult person.

Inspiratory reserve volume is the extra volume of air that can be inhaled into lungs during deepest possible inspiration.

Vital capacity is the sum of inspiratory reserve volume, tidal volume and expiratory reserve volume. It is about 4800 mL.

Total lung capacity is the sum of vital capacity and residual volume, ie, vital capacity minus residual volume.

Tidal volume is the amount of air, which normally passes into and out of the lungs during each cycle of quite breathing. It is about 800 mL in an adult person.

Inspiratory reserve volume is the extra volume of air that can be inhaled into lungs during deepest possible inspiration.