Question

Give a reason why lungs always contain residual volume of air?

Answer 1

Residual volume is the amount of gas remaining in the lungs at the end of a maximal exhalation. Thelungs always contain a residual volume of air so that during breathing cycle there is sufficient time for oxygen to be absorbed and for the carbon dioxide to be released

Answer 2

Residual volume is the amount of gas remaining in the lungs at the end of a maximal exhalation. The lungs always contain a residual volume of air so that during breathing cycle there is sufficient time for oxygen to be absorbed and for the carbon dioxide to be released.