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Hemoglobin is a protein in red blood cells that carries oxygen from the lungs to the body's tissues and returns carbon dioxide from the tissues back to the lungs.
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This is an essential mineral that forms part of hemoglobin, helping it carry oxygen.
Red Blood Cells: These are cells in our blood that contain hemoglobin. They transport oxygen around our bodies.
A large molecule composed of one or more chains of amino acids. Hemoglobin is an example of a protein.