The heart is divided into two sides and four chambers. The top two chambers, called the atria, are...
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The heart is divided into two sides and four chambers. The top two chambers, called the atria, are collection chambers for blood. The bottom two chambers, called the ventricles, receive the blood from the atria. The ventricles then pump it to the lungs and the body. The chambers are separated by valves which control the direction of blood flow. There are four valves: tricuspid, pulmonic, mitral and aortic.
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