Question

The given figure illustrates the changes in lung volume during the process of breathing.

The changes from II to III indicates the
A. movement of diaphragm away from the lungs
B. expansion of the thoracic cavity
C. movement of air out of the lungs
D. expansion of ribs.

Answer 1

Correct Answer - C
The change from II to III indicates decrease in the volume of lungs and thus, increase in the pressure of air inside the lungs. This results in movement of air out of the lungs.