In a developing embryo, erythrocyte production shifts from the vessel to the liver until the fifth month of gestation, when hematopoiesis begins to occur in the bone marrow.

Question

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By the fifth month of gestation, hematopoiesis begins to occur in the bone marrow and increases rapidly until hematopoietic (red) marrow fills the entire bone marrow space. By the time of delivery, the marrow is the only significant site of hematopoiesis.

In a Developing Embryo, Erythrocyte Production Shifts from the Vessel