Red Blood Cells
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Red blood cells are a major component in blood that transport oxygen and nutrients to other areas of the body. Red blood cells, like all blood cells, are produced in the bone marrow. They contain the substance hemoglobin, a complex organic molecule that includes iron, and allows them to readily bond to oxygen in the bloodstream. They lack a nucleus and thus contain no genetic material of their own. The lifespan of a red blood cell is about 120 days.