The Circulatory System helps you by what happens and how your blood gets oxygen and when your blood goes. When you breath in oxygen it goes into you lungs and takes the oxygen and you breath out carbon dioxide. The blood with the oxygen goes to the heart. At the heart it pumps blood through the body into your veins. In you veins carries blood around your body to the places that need blood. Plus your veins bring blood that needs oxygen and the heart will give the blood the oxygen that it needs. Back at the heart it collects energy and puts it in your body. that energy helps so that you can breath again.
by Roman Maal