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

Options

A. Inspiration is a passive process whereas expiration is active.
B. Inspiration is an active proces whereas expiration is passive.
C. Inspiration and expiration are active processes.
D. Inspiration and expiration are passive processes.

Answer

B

Explanation

Inspiration is the process which fresh atmospheric air enters into the alveoli of the lungs. It is in 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 inpirtory muscles.