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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 bone marrow produces all blood cells, except lymphocytes which are produced in the marrow and reach maturity in the generative lymphatic tissues, such as the thymus gland or bone marrow. This can turn into red marrow in emergencies. This also means within a few seconds or minutes. Bone Marrow makes blood cells.ed bone marrows produce the red blood cells while yellow bone marrows stores fat which the body consumes as a last resort in cases of extreme starvation. It also turns into r â¦ ed marrow in emergencies such as blood loss or anemia.