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Question

Erythropoiesis starts in

A
Spleen
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B
red bone marrow
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C
Kidney
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D
Liver
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Solution

The correct option is B red bone marrow
Erythropoiesis is the formation of red blood cells (erythrocytes) which occurs in the red bone marrow. Proerythroblasts is the earliest precursor which gives rise successively to the early erythroblast, intermediate erythroblast and late erythroblast. Then, the nucleus is forced out and a biconcave, enucleated cell called reticulocyte is formed, which is released into blood. In blood, it develops into mature erythrocytes.
Kidneys are the organs that filter waste products from the blood.
Spleen - Old red blood cells are recycled in the spleen, and platelets and white blood cells are stored there

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