The circulatory system

THE CIRCULATORY SYSTEM

The circulatory system is the system where the heart pumps blood around your body.  This explanation will tell you how the circulatory system works.

The heart is divided up into 4 parts, 2 are the atriums and they are above the 2 ventricles.  There are four gateways for the blood cells to go through that only open one way.  Then when the blood cells go to the atriums, the heart pushes the blood cells back through the circulatory system.

The red blood cells get the oxygen from the lungs and then takes the oxygen to the different parts of the body where it needs it.  When the red blood cells go back to the heart, there is the old oxygen which carries co2 or carbon dioxide that attaches to the red blood cells, so there is no old oxygen in your body.  There are two different tunnels the blood cells go through.  They are called arteries and the veins.  Arteries carry the oxygen and the veins carry co2.

When the blood cells get to the heart the heart takes the carbon dioxide to the lungs.  When the co2 gets to the lungs, the lungs make you breathe the co2 out of your body.  

This is what the circulatory system is used for and how the blood is pumped around the body.  If you didn't have your circulatory system then you would not be able to breathe, and then you won't be able to pump blood around your body.