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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.
The red blood cells are produced in the red bone marrow in the center of the bone. Marrow. Red blood cells, or erythrocytes, are made in the bone marrow as are white blood cel â¦ ls or leukocytes and they originate from stem cells.The production of red blood cells is also known as  hematopoiesis; this process occurs in the bone marrow. The  bone marrow is found in the spongy tissue in the middle of bones.  In this tissue there are pluripotent hematopoietic stem cells.