Coronary arteries supply blood to the heart muscle. There are two main coronary arteries: the right and the left.
Heart valves prevent the backward flow of blood. They act as one-way inlets of blood on one side of a ventricle and one-way outlets of blood on the other side of a ventricle.
Detailed anatomical description of the heart valves, including simple definitions and a labeled, full-color illustration
The heart is a pump made of muscle tissue. Its pumping action is regulated by electrical impulses.
Located almost in the center of the chest, the adult human heart is about the size of two fists held side-by-side.
Heart disease is one of the most serious health problems in the United States. Find out more facts and figures on this topic.
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