It is like this to pump blood around the body.

The heart is a very important part in the circulatory system

without it all your blood won't move. The more active you are

the faster your blood gets pumped around your body, this is because more oxygen is sucked into your body and carbon dioxide that is breathed out. This is called the Gas Exchange. This is when the two gases(oxygen and carbon dioxide)are changed.When you breath in your blood takes the oxygen to your right atrium and up your right ventricle then the carbon dioxide goes to the left atrium and then up your left ventricle then you breath out the carbon dioxide and every time that happens your heart is still pumping blood around your body..