Which mineral is bound by the oxygen-carrying protein in red blood cells?

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Multiple Choice

Which mineral is bound by the oxygen-carrying protein in red blood cells?

Explanation:
Hemoglobin, the protein in red blood cells that carries oxygen, relies on iron in its heme groups to bind oxygen reversibly. This iron atom (Fe2+) is what grabs oxygen in the lungs and releases it to tissues that need it. So the mineral bound by the oxygen-carrying protein is iron. Calcium, zinc, and magnesium have other roles in the body and are not the minerals that enable hemoglobin to transport oxygen.

Hemoglobin, the protein in red blood cells that carries oxygen, relies on iron in its heme groups to bind oxygen reversibly. This iron atom (Fe2+) is what grabs oxygen in the lungs and releases it to tissues that need it. So the mineral bound by the oxygen-carrying protein is iron. Calcium, zinc, and magnesium have other roles in the body and are not the minerals that enable hemoglobin to transport oxygen.

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