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Was (wer) ist marrow bone - definition
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![Hematopoietic precursor cells: [[promyelocyte]] in the center, two [[metamyelocyte]]s next to it and [[band cell]]s from a bone marrow aspirate.](https://commons.wikimedia.org/wiki/Special:FilePath/Bone marrow WBC.JPG?width=200 "Hematopoietic precursor cells: [[promyelocyte]] in the center, two [[metamyelocyte]]s next to it and [[band cell]]s from a bone marrow aspirate.")
![Bone marrow may have first evolved in ''[[Eusthenopteron]]'', a species of prehistoric fish with close links to early [[tetrapod]]s.}}](https://commons.wikimedia.org/wiki/Special:FilePath/Eusthenopteron BW.jpg?width=200 "Bone marrow may have first evolved in ''[[Eusthenopteron]]'', a species of prehistoric fish with close links to early [[tetrapod]]s.}}")
![megakaryocytic cells]].](https://commons.wikimedia.org/wiki/Special:FilePath/Trilineage hematopoiesis, annotated.jpg?width=200 "megakaryocytic cells]].")
Wikipedia
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Bone marrow is a semi-solid tissue found within the spongy (also known as cancellous) portions of bones. In birds and mammals, bone marrow is the primary site of new blood cell production (or haematopoiesis). It is composed of hematopoietic cells, marrow adipose tissue, and supportive stromal cells. In adult humans, bone marrow is primarily located in the ribs, vertebrae, sternum, and bones of the pelvis. Bone marrow comprises approximately 5% of total body mass in healthy adult humans, such that a man weighing 73 kg (161 lbs) will have around 3.7 kg (8 lbs) of bone marrow.
Human marrow produces approximately 500 billion blood cells per day, which join the systemic circulation via permeable vasculature sinusoids within the medullary cavity. All types of hematopoietic cells, including both myeloid and lymphoid lineages, are created in bone marrow; however, lymphoid cells must migrate to other lymphoid organs (e.g. thymus) in order to complete maturation.
Bone marrow transplants can be conducted to treat severe diseases of the bone marrow, including certain forms of cancer such as leukemia. Several types of stem cells are related to bone marrow. Hematopoietic stem cells in the bone marrow can give rise to hematopoietic lineage cells, and mesenchymal stem cells, which can be isolated from the primary culture of bone marrow stroma, can give rise to bone, adipose, and cartilage tissue.
