What is the main site for iron storage in the bone marrow?
a. Stem cells
b. Transferrin molecules
c. Endothelial cells
d. Macrophages
ANS: D
Macrophages are the primary site for storage of iron in the bone marrow. Stem cells of various kinds are precursors to blood cells. Transferrin is the protein that binds and transports iron to either storage or developing red blood cells (RBCs). Endothelial cells are the lining cells of the bone marrow and blood vessels.
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