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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.
Its matrix forms an open network of trabeculae.Spongy bone has no blood vessels in its trabeculae. The space between trabeculae isfilled with another tissue, red bone marrow, which has blood vessels and suppliesnutrients to the osteocytes.Red bone marrow is red because it forms red blood cells. In other bones, spongy bonemay hold yellow bone marrow, which is yellow because it stores fat.