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Red blood cells are found in arteries, veins, ventricles, and the heart. If red blood cells are found outside of these areas, there is usually a problem.
In the article on red blood cells, it is claimed that there are 20 - 30 trillion red blood cells alone (http://en.wikipedia.org/wiki/Red...), which make up one quarter of all cells in a human body, leading to an estimate of 80 - 120 trillion total cells.