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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.
Overview. Red blood cells are important for the transport of oxygen-rich blood to body tissues and removal of carbon dioxide from the body. Red blood cells are red because they contain an iron-rich protein known as hemoglobin, which is bright red in color. Over time, red blood cells wear out and die.