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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.
The main function of the circulatory system is to get blood throught the body. Your blood is pumped around by the heart which is the main function in your circulatory system. The heart sends blood through your blood vessels.The circulatory system consists of the heart, blood vessels, lymph, blood, and the lymphatic vessels and glands. Transport gases, like oxygen from the lungs to cells around the body and carbon dioxide from the cells to the lungs. 2  Transport nutrients like glucose. 3  Transport wastes from cells to organs that play the role of eliminating them. 4  It contains cells that fight infections and defend against foreign bodies.