The heart is divided into four chambers, as shown in figure 10. The two chambers in the top half of the heart are the right atrium and left atrium (plural, atria), that receive blood returning to the heart below the atria are the right ventricle and left ventricle (plural, ventricles), that pump blood away from e heart. Septum is a strong muscular wall that separates the right and left side of the heart Four valve Taps of tissue) are found in your heart to prevent the backflow of blood. The atrioventricular valves eparate the atria from the ventricles. Semilunar valves are also found in between each ventricle and the large blood vessels that carry blood away from the heart. These valves are flaps of tissue that open when the atria or ventricles contract, and close when the atria or ventricles relaxes.
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