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The Circulatory System:

The Circulatory System is a complex system which made up of one central organ, the heart. It pumps Oxygen to all different parts of the body. You heart is centrally located, The heart is two thirds to left the of the sternum. Your heart is the size of you fist, weighing a half a l

The is divided up in four chambers, the left and right atria and left and right ventricle. The atria is upper part of the heart, the ventricle are made up of the lower portion. The blood circulates oxygen for the growth and development of cells. The blood is made up of red and white cells, platelets. The white cells stop and help us from getting sick. The red cells carry the oxygen. The platelets are used when blood clots and to stop bleeding.

Once the blood gets to the heart the arteries carry the the blood which has been reoxygeated and then veins bring back blood which has be deoxygenated and ready to come back