Question

when do you think our pulse rate goes up

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 risemuch less than they do in an unfit person.

Answer 2

Carrier of oxygen and nutrients, the blood is literally the life line of all our organs
Sudden increase in our heart beat can cause our pulse rate goes up