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Heart-attack deaths have fallen 60 percent in three decades. Still, millions of Americans suffer from cardiovascular diseases linked with heart attacks and strokes.
Located almost in the center of the chest, the adult human heart is about the size of two fists held side-by-side.
The heart is a pump made of muscle tissue. Its pumping action is regulated by electrical impulses.
Coronary arteries supply blood to the heart muscle. There are two main coronary arteries: the right and the left.
Heart disease is one of the most serious health problems in the United States. Find out more facts and figures on this topic.
Detailed anatomical description of the heart valves, including simple definitions and a labeled, full-color illustration
Your heart has two sides that are separated by an inner wall. The right side pumps blood to the lungs to pick up oxygen. Then, oxygen-rich blood returns from the lungs to the left side of the heart, and the left side pumps it to the body, says the National Heart, Lung and Blood Institute.