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valves in the human body are just like water valves, when the heart pumps it pushes blood through veins and arteries. The valves keep the blood in forward motion preventing a back flow. there are valves in the veins but not in the arteries. The valves in the veins keep the unoxygenated blood moving towards the heart to be reoxygenated and keeps it from back flowing into the venus system There are valves in the heart also. there are valves between the upper chambers of the heart (the atria) and the lower chambers (the ventricles. They function the same way, by keeping the blood flowing in the right direction. There are also valve in the heart between the right ventricle flowing towards and thru the pulmonary vein on its way to the lungs and a valve between the left ventricle and the aorta, keeping the reoxygenated blood flowing forward to the rest of the body.

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