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.
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.