A client has fractured his sternum when his chest hit the steering wheel during an accident. Which of the following statements most accurately describes the physiologic function of bone marrow?
A) Hematopoiesis takes place in red bone marrow.
B) Yellow bone marrow predominates in infants.
C) By adulthood, all red bone marrow has been replaced by yellow bone marrow.
D) Yellow bone marrow is hematopoietically active in infants, but not in adults.
Ans: A
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Blood cell production takes place exclusively in red bone marrow, which predominates in infants and decreases (but not disappears) with age. Yellow bone marrow is composed primarily of adipose tissue and is not hematopoietically active. As the need for RBC production decreases during postnatal life, red marrow is gradually replaced with yellow bone marrow in most of the bones. In adults, red marrow persists in the vertebrae, ribs, sternum, and ilea.
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