ERYTHROPOIESIS
Definition: It is the process of formation of red blood corpuscles or erythrocytes in the human body
Site of formation:
Foetus: (early stages) Mesodermal cells of yolk sac
Adult: Mainly in bone marrow
Stages: The different stages of erythropoiesis are as follows:
a) Production of RBC at developmental stage:
I) Mesoblast Stage: From 3rd week of intrauterine life, RBC is produced by mesodermal cells of the yolk sac
II) Hepatic Stage: From 5th month of intrauterine life, Rbc production is taken over by liver and spleen. This stage lasts upto last trimester.
III) Myeloid Stage: After birth, red bone marrow of all bones start RBC production. After 20 years of age, RBC production is restricted to ends of long bones and membranous bones since red marrow is replaced by yellow marrow.
A) Genesis of Blood cells:
i) Committed stem cells of myeloid series (CFU-S & CFU-B)-They differeniate into RBC, neutrophil, monocyte, eosinophl, platelets
ii) Committed stem cells of lymphocyte series (LSC)- They differentiate into T- and B- lymphocytes.
Factors controlling:
a) Growth inducers: Interleukin-3
b) Differentiation inducers
B) Stages of Differentiation of RBC (Schematic):
Hemopoiesis is the term used to describe the formation of all blood cells. Erythropoiesis is the term used to describe only the formation of red blood cells.
Hypoxia in the blood triggers erythropoiesis.
Erythropoiesis requires B12, Folic acid and iron.
describe the four stages of the hypothesis for the origin of life on earth by chemical evolution
describe the key stages in the moitering process
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vitamin K
Anemia
thalassemia
There are three main events that are considered stimuli for erythropoiesis. These are aerobic exercises, living in an environment with a high altitude, and hemorrhages.
Sanford B. Krantz has written: 'Erythropoietin and the regulation of Erythropoiesis' -- subject(s): Erythropoiesis, Erythropoietin
the stages of the two meiotic divisions of meiosis?