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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 four major functions of the cardiovascular system are: 1. To transport nutrients, gases and waste products around the body. 2. To protect the body from infection and blood loss. 3. To help the body maintain a constant body temperature (âthermoregulationâ). 4.he systemic circuit is made up of the heart and all the remaining arteries, arterioles, capillaries, venules, and veins in the body. This circuit pumps oxygenated (red) blood from the heart to all the tissues, muscles and organs in the body, to provide them with the nutrients and gases they need in order to function.