At what age is it normal for bone marrow cellularity to be 80% to 90% (i.e., has very little fat)?
a. At birth
b. In an 8 year old
c. In a 20 to 40 year old
d. In those older than 70 years
ANS: A
At the time of birth, the bone marrow is fully active and extremely cellular with very little fat. It contains all hematopoietic cell lineages.
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