Residual volume of lung is defined as: March 2013: (A) Additional volume of air that can be inspired forcefully after the end of normal inspiration, (B) Volume of air breathed out of lungs in a single normal quiet respiration, (C) Additional volume of air that can be expired forcefully after normal expiration, (D) Volume of air remaining in lungs even after forced expiration
Answer is D. Ans. D i.e. Volume of air remaining in lungs even after forced expiration