Describe the origin and lifecycle of the red blood cells.

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Medical Sciences

Describe the origin and lifecycle ofthe red blood cells.

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ERYTHROPOIESISErythropoiesis is the process of the origin development andmaturation of erythrocytes Hemopoiesis or hematopoiesis is theprocess of origin development and maturation of all the bloodcellsSITE OF ERYTHROPOIESISIn fetal life the erythropoiesis occurs in three stagesMesoblastic StageDuring the first two months of intrauterine life the RBCs areproduced from the mesenchyme of the yolk sacHepatic StageFrom the third month of intrauterine life the liver is the mainorgan that produces RBCs Spleen and lymphoid organs are alsoinvolved in erythropoiesisMedullary StageDuring the last three months of intrauterine life the RBCs areproduced from red bone marrow and liver The medullaryhematopoiesis becomes more effective towards the end of the thirdtrimester After birth the bone marrow becomes the sole site oferythropoiesis In the adolescent period the marrow cavities ofall bones are involved in erythropoiesis after which the regressesin the limb bonesSteps of erythropoiesisStem cellsPluripotent stem cellThey are the See Answer

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