Erythropoiesis starts in:
Spleen
Red bone marrow
Kidney
Liver
As learnt in
Erythropoietin -
The juxtaglomerular cells of kidney produce a peptide hormone called erythropoietin which stimulates erythropoiesis (formation of RBC).
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Erythropoiesis starts in mesoderm of yolk sac from third week to third month of gestation. Between third month to fifth month, it occurs in liver and spleen and from fifth month onward occurs in red bone marrow.
Option 1)
Spleen
This option is incorrect
Option 2)
Red bone marrow
This option is incorrect
Option 3)
Kidney
This option is incorrect
Option 4)
Liver
This option is correct