Bone marrow is a soft, spongy tissue found in the center of most bones. It is responsible for producing red and white blood cells, platelets, and other components of the blood. The two crossword solutions for the term bone marrow are myelo (5 letters) and MEDULLA (7 letters). Myelo refers to the innermost layer of bone marrow, while MEDULLA refers to the outermost layer. Both layers are essential for the production of blood cells.