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The veins carry deoxygenated blood back to the heart and lungs for reoxygenation. The arteries carry blood and the oxygen riding on the red blood cells around the body, supplying oxygen and nutrients to the various muscles, tissues and organs. Once these are delivered, the veins deliver the red blood cells back to the heart and lungs so they can pick up more oxygen and nutrients and continue cycling through the body. Veins have lower blood pressure which is why they are able to cope being closer to the skin surface and cause less blood loss when cut. They are also comprised of valves to allow blood to travel in one direction only.
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