Erythropoiesis starts in - DASH

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Erythropoiesis starts in

spleen

red bone marrow

kidney

liver

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Step-by-Step Explanation Step 1: Understanding the Term "Erythropoiesis" Erythropoiesis is the biological process of producing red blood cells (RBCs), which are crucial for transporting oxygen throughout the body. This process involves multiple stages of precursor cells developing into mature erythrocytes. Step 2: Early Sites of Erythropoiesis in Embryonic Development During the initial stages of embryonic development, erythropoiesis occurs in the yolk sac (first month). As the embryo grows, the liver takes over as the predominant site from around the fifth week. Step 3: Role of Red Bone Marrow By around the sixth month of fetal development and continuing after birth, the red bone marrow becomes the principal and most long-lasting site of RBC production. In an adult human, active erythropoiesis occurs primarily in the red bone marrow of certain bones such as the sternum, vertebrae, ribs, and pelvis. Step 4: Conclusion Although the embryonic and fetal stages involve transient sites (yolk sac and liver), after birth the primary and sustained site where erythropoiesis occurs is the red bone marrow. Hence, the correct answer is red bone marrow.

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