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The Circulatory/Blood System

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The circulatory/blood system contains erythrocytes (red blood cells), leukocytes (white blood cells), and platelets. It also contains plasma, bone marrow, the spleen, and the thymus. The main function of the erythrocytes (red blood cells) is to carry oxygen throughout the body. The main function of the leukocytes (white blood cells) is to fight infection. Platelets are also known as megakaryocytes. Platelets are mostly needed for the clotting process. Erythrocytes have about five million red blood cells per cubic millimeter of blood. Leukocytes have about four thousand eight hundred to ten thousand eight hundred white blood cells per cubic millimeter of blood. We have more red blood cells than we do white blood cells. Platelets have about one

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