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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.
Red blood cells are produced in spongy bone marrow, transport through canaliculi into small capillaries in the periosteum. These tiny blood vessels expand after they exit the compact bone, into larger caplliaries, and eventually the major blood stream.here are two types of bone marrow: red marrow and yellow marrow. Red blood cells, platelets and most white blood cells arise in red marrow, although some white blood cells develop in yellow marrow.