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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.
What bone marrow is. Bone marrow is a spongy material that fills the bones. It contains early blood cells, called stem cells. These develop into the 3 different types of blood cell.Normally stem cells in your bone marrow keep dividing to make new blood cells. This keeps the numbers of cells circulating in your blood within a normal range.hat bone marrow is. Bone marrow is a spongy material that fills the bones. It contains early blood cells, called stem cells. These develop into the 3 different types of blood cell.