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Muscle contraction that pushes blood through the blood vessels. You will hear the valves opening and closing
Carries blood from the heart to the lungs, the only artery that doesn't carry oxygenated blood
Carries blood from the lungs to the heart, the only vein that carries oxygenated blood
White Blood Cells
Are also made in blood marrow and are they body's disease fighters that kill disease-causing organisms by releasing antibodies
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