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Bone marrow is the soft, sponge-like tissue that fills the hollow center of bones. There are two types of bone marrow: red marrow and yellow marrow. Red Marrow-Consisting mainly of hematopoietic tissue, or tissue involved in the formation of red blood cells, all bone marrow is red at birth.About 50% of red marrow converts to yellow marrow over time.one marrow is the soft, sponge-like tissue that fills the hollow center of bones. There are two types of bone marrow: red marrow and yellow marrow. Red Marrow-Consisting mainly of hematopoietic tissue, or tissue involved in the formation of red blood cells, all bone marrow is red at birth.
The red bone marrow inside larger bones, such as the scapulae, is the site of production of red blood cells. (Red blood cells, white blood cells and blood platelets are described on structure and functions of blood.) 6. With increasing age some bone marrow changes from 'red bone marrow' to 'yellow bone marrow'.