Question

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

The correct option is A Movement of diaphragm away from the lungs

During inspiration, diaphragm contracts and this movement pulls the lungs downward thereby increasing their volume. During resting breathing, this movement continues until achieving the tidal volume. Consequently, relaxation of the diaphragm initiates expiration.

So, option A is the correct option.