Question

After complete exhalation the lungs of a healthy man contains a litre of gas; this quantity is known as:

• A. Residual volume
• B. Functional residual capacity
• C. Total lung capacity
• D. Dead space

Answer 1

The correct option is A Residual volume

The lungs are never completely empty. There is always some air left in the lungs even after a maximal exhalation. The expiratory reserve volume (ERV), about 1,200 mL, is the additional air that can be forcibly exhaled after the expiration of a normal tidal volume. Residual volume (RV), about 1,200 mL, is the volume of air still remaining in the lungs after the expiratory reserve volume is exhaled.