Multiple choice

Which of the following is the earliest site of hematopoiesis in the embryo?

  1. Bone marrow

  2. Liver

  3. Spleen

  4. Yolk sac

  5. Thymus

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Hematopoiesis originates in the early yolk sac but as embryogenesis proceeds, this function is taken over by the fetal liver and spleen, then later by the bone marrow where it continues throughout life.

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