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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.
Red blood cells are red because of the presence of hemoglobin. The disease sickle-cell anemia is a result of red blood cells that have become deformed by abnormal hemoglobin. The formed elements include platelets, white blood cells, and red blood cells. People with type O blood have blood with both A and B antigens.