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The Human Body:
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Bone Marrow
All the red blood cells and many white blood cells are made in the bone marrow. Marrow builds red blood cells at over 5 million cells per second. It lay inside the bones, the mass of soft jelly. As one grows older, some bone marrow stops producing blood cells. In adults, blood is mainly made in the marrow of the skull, backbone and hip bones. There is about 3000 to 4000 m3 of bone marrow in a body. Platelets also come from the marrow.
There’s red and yellow bone maroow. Red marrow makes almost all blood cells. Yellow marrow contains a lot of fat cells and produces only a few blood cells.
Red blood cells begin as stem cells in the marrow. The marrow chooses a stem cell and turns it into erythroblast. Inside the erythroblast, there’s a nucleus. As the cell grows up, the nucleus divides many times and eventually disappears. When it is loaded with haemoglobin and ucleus gone, it is now an erythrocyte.
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