Question

What is vital capacity of our lungs?

• A. Inspiratory reserve volume plus expiratory reserve volume
• B. Total lung capacity minus residual volume
• C. Inspiratory reserve volume plus tidal volume
• D. Total lung capacity minus expiratory reserve volume

Answer 1

The correct option is B Total lung capacity minus residual volume

• Vital Capacity (VC) is the maximum volume of air that can be exhaled following a deep inspiration. This is the total of Inspiratory Reserve Volume (IRV) + Tidal Volume (TV) + Expiratory Reserve Volume (ERV). Total Lung Capacity (TLC): residual volume (RV) + vital capacity (VC).

Hence VC = TLC - RV.

So, the correct answer is option B.