__________ is required for hemoglobin synthesis.
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Answer: B. Iron
Explanation
Iron is a vital trace mineral required for the synthesis of functional hemoglobin molecules. Without adequate iron atoms, the heme component cannot bind oxygen effectively within red blood cells. Dietary iron deficiency directly impairs the body's ability to manufacture sufficient healthy erythrocytes. Hemoglobin contains four iron-containing heme groups capable of binding atmospheric oxygen molecules. The human body recycles iron from aged red blood cells destroyed in the spleen. Dietary sources of iron include leafy green vegetables, red meat, and fortified grains.
Iron deficiency anemia causes chronic fatigue and weakness due to reduced oxygen delivery. Medical professionals monitor serum iron levels to diagnose various nutritional and metabolic disorders. Pregnant women require increased iron intake to support expanded blood volume and fetal development. Calcium provides structural strength for bones and teeth but does not synthesize hemoglobin. Water serves as the universal biological solvent but contains no mineral components for hemoglobin. Carbohydrates supply cellular energy through metabolic breakdown rather than acting as mineral building blocks.
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