Q.1
Erythropoesis occurs in following organs
(A) . Liver
(B) . Spleen
(C) . Bone Marrow
Choose the correct answer from the options given below:
- Chronology of Erythropoiesis:
- In vertebrate ontogeny and adult homeostasis, erythropoiesis occurs across multiple anatomical sites:
- Embryonic / Fetal Phase:
- Mesoblastic phase: Yolk sac blood islands.
- Hepatic phase: (A) Liver serves as the major erythropoietic organ during the second trimester.
- Myeloid / Splenic phase: (B) Spleen actively generates erythrocytes during mid-gestation (and retains extramedullary erythropoietic capacity during severe adult anemia).
- Adult Phase:
- Bone Marrow (red marrow) is the primary lifelong site of adult erythropoiesis.
- nalysis:
- All three organs (A, B, and C) participate in erythropoiesis across developmental and compensatory stages. Hence, Option 1 is correct.
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