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What is vital capacity of our lungs?

1. Inspiratory reserve volume plus tidal volume
2. Total lung capacity minus expiratory reserve volume
3. Inspiratory reserve volume plus expiratory reserve volume
4. Total lung capacity minus residual volume

Correct answer: Total lung capacity minus residual volume

Solution

Vital capacity is the maximum volume of air that can be expelled after a maximal inhalation. Since residual volume is the air that cannot be exhaled, subtracting it from total lung capacity gives vital capacity.

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