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Coronary circulation is the circulation of blood in the blood vessels of the heart muscle. The vessels that deliver oxygen-rich blood to the myocardium are known as coronary arteries. The vessels that remove the deoxygenated blood from the heart muscle are known as cardiac veins. Most tissue perfusion in the heart occurs when the coronary arteries open during diastole.
So, you can say that main function of the heart is to supply all the body cells with oxygen and nutrients through the circulation of blood. Function of the Blood and Blood Vessels: If you have a bit of knowledge about the circulatory system, it would be clear to your that the function of the blood is to serve as a circulatory fluid.