PHGY 209 Lecture Notes - Lecture 8: Lymphatic System, Viscosity, Hemoglobin
3 Oct 2016
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Leukopoiesis: production of white blood cells. All blood cells are ultimately derived from pluripotential stem cells: they can devide to form more pluripotential stem cells, can be induced by inducer to produce one of the blood types. Commited stem cells: upon stimulation pluripotential stem cells give rise to committed stem cells, thrgouh division and differentiation. Give rise to: leukocytes, platelets, erythrocytes. Occurs under its influence of bone marrow stem cells can reconstitute all hematopoietic cell types. Prenatal: initially produced in the yolk sac, 2 month liver produce then decrese production, after 3 months the bone marrow starts to take over. Long bones have epiphysis and diaphysis end. The epiphyses end undergoes hematopoeies but the other end doesn"t. In extreme situations the body can revert to producing blood cells from the previous locations but it is highly abnormal: long bones, liver spleen, yolk sac. Functions: facilitate transport of respiratory gasses between lungs and cells. Shape: biconcave disk, advantage of shape.
