Why does heart pump quick when you run?

Answer 1

During exercise your body requires up to 10 times the ammount of oxygen that you need at rest. You can only extract about 3 times as much O2 from the blood as at rest,

so you must increase your cardiac output by about 3 times too.

increased cardiac output = increased cardiac rate.

(NOT the other way around)

Answer 2

When you exercise your muscles burns more "fuel", and the "fuel" is carried to the muscles with the blood. So the heart has to pump faster to keep the muscles supplied with the "fuel" they need when you exercise.

Answer 3

To create energy to move our bodies, our cells break down sugar in a process called 'cellular respiration'. Like the respiration that you associate with your lungs, cellular respiration requires oxygen. This energy-releasing reaction uses up the oxygen and reacts it with the sugar, releasing carbon dioxide and water.

This happens all the time, which is why we need to breathe at a steady rate all the time. But when we exercise, more carbon dioxide builds up in the body and we need more oxygen for cellular respiration, so we breathe faster.

Answer 4

This is to make sure that all parts of the body are receiving blood and oxygen all the time. The faster you run, the faster your heart will beat.