The function of red blood cells is to bring oxygen to the heart. The function of the red blood cells is to carry oxygen around the body after the blood has been pumped around the body. That travels at a quick and intense speed,the veins and arteries have a difference as well this is that the arteries has a bigger wall around the outside to stop the arteries from splitting and letting your blood out, the viens only need a small outer wall because the blood isnt high pressure to when it is travelling through the arteries to carry oxygen around the body.
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