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→Regulation
==Regulation==
==Regulation==
Production of [[Erythrocytes|erythrocytes]] is regulated by '''erythropoietin''' (EPO) which is produced in the yolk sac, [[Liver - Anatomy & Physiology|liver]] and kidney from embryonic life until early neonatal life. In the adult it is produced in the kidneys. Erythropoietin is a glycoprotein hormone and acts under a negative feedback. Levels are normally kept low with sufficient amounts to maintain production of enough new erythrocytes. However, as the blood oxygen concentration decreases, the release of erythropoietin increases.
Production of [[Erythrocytes|erythrocytes]] is regulated by '''erythropoietin''' (EPO) which is produced in the yolk sac, [[Liver - Anatomy & Physiology|liver]] and kidney from embryonic life until early neonatal life. In the adult it is produced only in the kidneys. Erythropoietin is a glycoprotein hormone and is controled by a negative feedback mechanism. Normal levels are low with sufficient amounts to maintain a basal level of new erythrocyte production. If blood oxygen concentration falls, the release of erythropoietin rises.
EPO is transported from kidneys to [[Bone Marrow - Anatomy & Physiology|bone marrow]] where it acts upon receptors on the CFU-E’s and causes differentiation into erythrocyte precursors. It also increases the rate of division and maturation of the developing erythrocyte precursors by increasing gene transcription. Thus it is not the number of [[Erythrocytes|erythrocytes]] but the oxygen concentration that regulates its release. EPO release can be affected by any form of renal pathology.
EPO is transported from kidneys to [[Bone Marrow - Anatomy & Physiology|bone marrow]] where it acts upon receptors on the CFU-E’s and causes differentiation into erythrocyte precursors. It also increases the rate of division and maturation of the developing erythrocyte precursors by increasing gene transcription. Thus it is not the number of [[Erythrocytes|erythrocytes]] but the oxygen concentration that regulates its release. EPO release can be affected by any form of renal pathology.