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Practice MCAT Question - Q115 - Answer!

A deficiency of Fe in the diet can result in

A.  reduced hemoglobin concentration in erythrocytes.
B.  reduced oxygen-carrying capacity.
C.  reduced size of erythrocytes.
D.  All of the above

The correct answer is (D). Fe is the component of heme (part of hemoglobin) to which oxygen binds in RBCs. An iron deficiency prevents normal levels of hemoglobin from being made. As a result, RBCs can be smaller and the blood’s oxygen carrying capacity will be reduced.

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