File:Hematopoietic and stromal cell differentiation.jpg: Difference between revisions

Revision as of 10:08, 25 January 2014

Cartoon showing the origin of different connective tissue cells from a common stem cell population lying within the bone marrow.

Links: Stem Cells | Blood Development | Bone Development

haematocrit - The percentage by volume of red blood cells in whole blood.
haematopoietic stem cell - (HSC) The stem cell population that generates (haemopoiesis) all the cells found in blood (red blood cells and white blood cells). In the embryo these stem cells are mesoderm in origin, initially in the yolk sac mesoderm, then the liver and other organs, finally residing in the bone marrow.
haemopoiesis - The term used to describe the process of blood cell formation/differentiation from blood stem cells. In the embryo, this is mainly red blood cell formation which begins in the yolk sac mesoderm, then the liver and other organs finally residing in the bone marrow.

Blood Cells
Adult human blood cell numbers shown in the table below is for reference purposes. Blood Cell Numbers The adult ranges of cells / 1 litre (l), total blood volume is about 4.7 to 5 litres. Blood Development \| Blood Histology Red Blood Cells Male: 4.32 - 5.66 x 10¹²/l Female: 3.88 - 4.99 x 10¹²/l Leukocytes (white blood cells) Male: 3.7 - 9.5 x 10⁹/l Female: 3.9 - 11.1 x 10⁹/l Granulocytes 1.8 - 8.9 x 10⁹/l Neutrophils: 1.5 - 7.4 x 10⁹/l Eosinophils: 0.02 - 0.67 x 10⁹/l Basophils: 0 - 0.13 x 10⁹/l Non-Granulocytes Monocytes 0.21 - 0.92 x 10⁹/l Lymphocytes 1.1 - 3.5 x 10⁹/l B-cells: 0.06 - 0.66 x 10⁹/l T-cells: 0.77 - 2.68 x 10⁹/l CD4+: 0.53 - 1.76 x 10⁹/l CD8+: 0.30 - 1.03 x 10⁹/l NK cells: 0.20 - 0.40 x 10⁹/l Platelets 140 - 440 x 10⁹/l not a cell, a cell fragment.

Image source: NIH Stem Cells Information

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 * '''haematocrit''' - The percentage by volume of red blood cells in whole [[Cardiovascular_System_-_Blood_Development|blood]].
+* '''haematopoietic stem cell''' - (HSC) The stem cell population that generates (haemopoiesis) all the cells found in blood (red blood cells and white blood cells). In the embryo these stem cells are mesoderm in origin, initially in the yolk sac mesoderm, then the liver and other organs, finally residing in the bone marrow.
 * '''haemopoiesis''' - The term used to describe the process of blood cell formation/differentiation from blood stem cells. In the embryo, this is mainly red blood cell formation which begins in the yolk sac mesoderm, then the liver and other organs finally residing in the [[Bone Development|bone marrow]].