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The heart is the main component of the circulatory system. It is made up of four chambers, the right and left atrium and the right and left ventricle. The heart's main function is to pump blood through the body. This pumping occurs in two stages each time the heart beats. The diastolic stage occurs when the heart is at rest and the systolic stage when the heart contracts to pump deoxygenated blood toward the lungs and oxygenated blood to the body. Blood is made up of three types of cells: red blood cells, white blood cells and platelets. The red blood cells carry the oxygen to all the cells in the body...
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