Question

During the breathing cycle, when air is taken in and let out:

• A. The lungs never contain a residual volume of air
• B. The lungs always contain a residual volume of air
• C. The lungs contain a residual volume of air during heavy exercise
• D. The lungs sometimes contain a residual volume of air

Answer 1

The correct option is B

The lungs always contain a residual volume of air

During the breathing cycle, when air is taken in and let out, the lungs always contain a residual volume of air so that there is sufficient time for oxygen to be absorbed and for the carbon dioxide to be released.