Question

Mark the true statement among the following with reference to normal breathing.

• A. Inspiration is a passive process where as expiration is active
• B. Inspiration is an active process where as expiration is passive
• C. Inspiration and expiration both are active processes
• D. Inspiration and expiration both are passive processes

Answer 1

The correct option is B Inspiration is an active process where as expiration is passive

Inspiration is the process by which fresh atmospheric air enters into the alveoli of the lungs. It is an active process and is brought about by activity of inspiratory muscles.

Expiration is the process by which foul air is expelled out of the lungs. Expiration is a normal passive process that involves relaxation of inspiratory muscles.