Site of RBC formation in 20 years old healthy male is____________?
Correct answer: D. Flat bones
- A. Yolk sac
- B. Long bones
- C. Liver
- D. Flat bones
Explanation
By about 20 years of age, active red-cell production is concentrated mainly in the axial skeleton, particularly the flat bones such as the sternum, ribs and pelvis. The liver and yolk sac are fetal sites, while most long-bone marrow becomes fatty after childhood.
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