Question

what happen to rate of breathing during vigorous exercise and why?

Answer 1

Your heart speeds up to pump extra food and oxygen to the muscles. Breathing speeds up to get more oxygen and to get rid of more carbon dioxide. When a fit person, such as an athlete, exercises the pulse rate, breathing rate and lactic acid levels rise much less than they do in an unfit person.

Answer 2

The rate of breathing increases while vigorous exercise as more oxygen is sent to muscles by heart and so it pumps more rapidly.....