What is the normal bone marrow cellularity in the population older than 65 years?
a. 90%
b. 70%
c. 50%
d. 30%
ANS: D
Bone marrow cellularity decreases in the older population and is approximately 30%. That of a young adult is 50%. This change may be caused by an increase in the volume of spongy tissue in the bone, as well as an increase in fat, rather than an actual decrease in hematopoietic tissue.
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