During human embryonic development, first site of RBC formation is
Correct answer: A. Yolk sac
- A. Yolk sac
- B. Allantois
- C. Notochord
- D. Blastocyst
Explanation
In the human embryo, the first site of blood formation is the yolk sac. Later in embryonic life, the liver becomes the most important red blood cell-forming organ, but it is soon succeeded by the bone marrow, which in adult life is the only source of both red blood cells and the granulocytes.
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