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A healthy red blood cell lasts for roughly days. In case your childhood wasn't enough to give you an accurate idea of its location, the anus is essentially the valve that stands between your poop and the toilet. Everyone knows that when you get cut, you bleed—a result of the constant movement of blood through our bodies. He also showed how valves in veins helped control the flow of blood through the body. It also carries carbon dioxide from those cells back to the lungs. When a third antigen, called the Rh factor, is present, the blood type is classified as positive.

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In , research led by Stanford University scientists found that injecting the plasma of young mice into older mice improved memory and learning.

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In part by dissecting living animals and studying their still-beating hearts, Harvey was able to describe how the heart pumped blood through the body and how blood returned to the heart. Doctors still use bloodletting and leeches to treat diseases. Red blood cells contain an important protein called hemoglobin that delivers oxygen to all the other cells in our bodies. People with Type A blood have only A antigens attached to their red cells but have B antigens in their plasma.

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