alleryStart learning →Following birth, where does most hemopoiesis occur?
AIn the fetal yolk sac
BIn the thymus and spleen
CIn the medullary cavity only
DIn the red bone marrow
Answer & Solution
Correct answer: D. In the red bone marrow
1. Before birth, blood formation moves through the yolk sac, the fetal liver, the spleen and lymphatic tissue.
2. It settles in the red bone marrow, a connective tissue held in the spaces of spongy bone.
3. After birth the red marrow carries out most hemopoiesis.
4. The liver and spleen keep a reserve capacity, but they take over only when marrow function fails.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 18 "The Cardiovascular System: Blood", section 18.2 Production of the Formed Elements_
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