Coronary heart disease is the narrowing of the coronary arteries caused by the buildup of plaque within the walls this results in decreased blood flow and decreased oxygen to the heart muscles a myocardial infarction or heart attack can occur when blockage of a coronary artery results in damage to the heart musculature. There are two types of blood vessels in the circulatory system of the body arteries that carry oxygenated blood from the heart to various parts of the body and veins that carry blood towards the heart for purification overview arteries are red blood vessels that carry blood away from the heart . The cardiovascular system consists of the heart blood vessels and the approximately 5 liters of blood that the blood vessels transport responsible for transporting oxygen nutrients hormones and cellular waste products throughout the body the cardiovascular system is powered by the bodys hardest working organ the heart which is only about the size of a closed fist. Arteries are blood vessels responsible for carrying oxygen rich blood away from the heart to the body veins are blood vessels that carry blood low in oxygen from the body back to the heart for
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