BSIP, GILLES / SCIENCE PHOTO LIBRARY BSIP, GILLES / SCIENCE PHOTO LIBRARY
Bone marrow. Cutaway artwork showing the bone marrow (red) inside a bone. Bone marrow produces blood cells. Red blood cells have a very short working life and are constantly produced to maintain the oxygen-carrying capability of the blood. They develop from stem cells (upper right), losing their cell nucleus as they become specialised oxygen-carrying cells. They are seen circulating with other blood cells (lower right).
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