Where is most of the iron in the body found?
a. Attached to hemoglobin in the red blood cells (RBCs)
b. Stored in macrophages in the bone marrow
c. Attached to transferrin
d. Myoglobin
ANS: A
Approximately 70% of total body iron is found in hemoglobin. Another 25% is stored as ferritin or hemosiderin in macrophages, and about 5% is found in myoglobin. The remainder is found primarily in iron-containing enzymes. A small amount is bound to iron for transport.
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