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a soft pulpy tissue that lies in the spaces between the trabeculae of all bones. The marrow is active in providing a continual supply of red blood cells, white blood cells and platelets to meet the body's demand for oxygenation, immunity and coagulation. The bone marrow is composed of a variety of cells (blood cells in all stages of development, fat cells and reticulum cells), connective tissue and a mineralized osseous matrix. Bone marrow may be red (haematopoietically active) or yellow (fatty). The proportions of these two types vary at any given time, depending on the age and health of the person and on the specific bone or bone site being sampled. Although at birth red marrow is present throughout the skeleton, normally the marrow converts from haematopoietic to fatty marrow as the child grows older http://www.medcyclopaedia.com/library/topics/volume_iii_1/b/bone_marrow.aspx

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16y ago

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