Question:
The erythropoietic organs of a foetus are ________ and ________.
The erythropoietic organs of a foetus are ________ and ________.
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Sequence: Yolk sac $\rightarrow$ Liver + Spleen $\rightarrow$ Bone marrow.
Updated On: May 4, 2026
- spleen ; kidneys
- liver ; spleen
- kidneys; yellow bone marrow
- lymph nodes; kidneys
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The Correct Option is B
Solution and Explanation
Concept:
Erythropoiesis (formation of RBCs) occurs in different organs during different stages of life.
Step 1: Understand fetal erythropoiesis. In the foetus:
• Early stage → Yolk sac
• Middle stage → Liver (main organ) and spleen
• Late stage → Bone marrow takes over
Step 2: Identify correct organs. Thus, the main erythropoietic organs in a foetus are liver and spleen.
Step 3: Analyze options.
• (A) Spleen and kidneys → Kidneys are not erythropoietic $\times$
• (B) Liver and spleen → Correct \checkmark
• (C) Kidneys and yellow marrow → Incorrect $\times$
• (D) Lymph nodes and kidneys → Incorrect $\times$
Step 4: Conclusion. \[ \text{Foetal erythropoiesis occurs in liver and spleen} \]
Erythropoiesis (formation of RBCs) occurs in different organs during different stages of life.
Step 1: Understand fetal erythropoiesis. In the foetus:
• Early stage → Yolk sac
• Middle stage → Liver (main organ) and spleen
• Late stage → Bone marrow takes over
Step 2: Identify correct organs. Thus, the main erythropoietic organs in a foetus are liver and spleen.
Step 3: Analyze options.
• (A) Spleen and kidneys → Kidneys are not erythropoietic $\times$
• (B) Liver and spleen → Correct \checkmark
• (C) Kidneys and yellow marrow → Incorrect $\times$
• (D) Lymph nodes and kidneys → Incorrect $\times$
Step 4: Conclusion. \[ \text{Foetal erythropoiesis occurs in liver and spleen} \]
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