Question

A person will breathe deeply and rapidly for some time after a period of strenuous exercise. The longer and more intense the exercise, the longer and deeper the breathing will be and this will continue after the exercise stops. Using your understanding of cellular respiration, why strenuous exercise stimulates deep breathing?

• A. More rapid heartbeat
• B. More consumption of oxygen by cells
• C. More release of $C{O}_2$ by cells
• D. Both A and B

Answer 1

The correct option is D Both A and B

Respiration releases energy for cells from glucose. This can be aerobic respiration, which needs oxygen, or anaerobic respiration, which does not. During exercise, the breathing rate and heart rate increase. During hard exercise, an oxygen debt may build up. During exercise, the muscle cells respire more than they do at rest. This means oxygen and glucose must be delivered to them more quickly. Waste carbon dioxide must be removed more quickly. This is achieved by increasing the breathing rate and heart rate. So, a person will breathe deeply and rapidly for some time after a period of strenuous exercise. The longer and more intense the exercise, the longer and deeper the breathing will be and this will continue after the exercise stops.

Therefore, the correct answer is option D.