The heart muscle needs oxygen-rich blood to do its job. The vessels that feed the heart are called coronary arteries (shown in the diagram right) and they branch off from the body’s main artery, the ...

The semilunar valves stop the back flow of blood into the heart. There is a semilunar valve where the aorta leaves the left ventricle and another where the pulmonary artery leaves the right ventricle.

Coronary artery disease (CAD) is a type of heart disease that occurs when your coronary arteries don’t supply enough blood to your heart. CAD often develops because of a waxy substance buildup called ...

the diseased sections of your coronary arteries are bypassed with healthy artery or vein grafts to increase blood flow to the heart muscle tissue. This procedure is also called coronary artery bypass ...