Which mineral is a core component of the heme group in hemoglobin?

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Multiple Choice

Which mineral is a core component of the heme group in hemoglobin?

Explanation:
At the heart of the heme group is an iron atom coordinated within a porphyrin ring. This iron is the central metal that binds oxygen in each subunit of hemoglobin, enabling the transport of oxygen from the lungs to tissues. In its usual ferrous state (Fe2+), it reversibly binds O2, allowing uptake and release as needed; the iron can cycle between oxidation states during this process. Other minerals listed—zinc, copper, magnesium—support many enzymes and bodily functions, but they do not form the central metallic component of the heme group. Iron is the essential mineral for the heme iron and its oxygen-binding function in hemoglobin.

At the heart of the heme group is an iron atom coordinated within a porphyrin ring. This iron is the central metal that binds oxygen in each subunit of hemoglobin, enabling the transport of oxygen from the lungs to tissues. In its usual ferrous state (Fe2+), it reversibly binds O2, allowing uptake and release as needed; the iron can cycle between oxidation states during this process. Other minerals listed—zinc, copper, magnesium—support many enzymes and bodily functions, but they do not form the central metallic component of the heme group. Iron is the essential mineral for the heme iron and its oxygen-binding function in hemoglobin.

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