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Source: U.S. Food and Drug Administration, Department of Health and Human Services. www.fda.gov
Main pulmonary artery
Superior vena cava
Left pulmonary artery
The heart is about the size of your fist.
It is responsible for pumping blood to the entire body.
In a healthy adult, the body contains about 2 gallons (5 liters) of blood that is circulated over and over through the body. The blood moves from the heart, into arteries, capillaries, and veins before returning to the heart.
The entire cycle takes about 60 seconds, during which time the blood carries oxygen and nutrients to all the cells in the body.
The blood vessels that bring oxygen and nutrients to the heart muscle itself are called the coronary arteries.
The heart is divided into four compartments (chambers).
The atrial septum divides the right and left atria.
The ventricular septum divides the right and left ventricles.
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