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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 coronary circuit is the shortest circulation in the body. Blood in the chambers of the heart provide little oxygen & nutrients to the heart wall. The myocardium is too thick for effective diffusion. Therefore, the heart has its own circulation. In fact, the first branches of the aorta go back to the heart itself. These are the right & left coronary arteries.