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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.
Hi,   Bone marrow is the spongy material found in the center of most large bones in the body. Bone marrow produces red blood cells, white blood cells and platelets.Along w â¦ ith a biopsy (the sampling of mostly solid tissue or bone), an aspiration (the sampling of mostly liquid) is often done on the same time.:) Bone marrow is not a bone.retty much all bones contain trabecular bone-so all contain bone marrow (with the exception of the bones in your middle ear mabye).