IRON
Hemoglobin combines readily with oxygen.
Hemoglobin
The hemoglobin in the red blood cell allows it to carry oxygen.
Hemoglobin is the protein in red blood cells that enables them to carry oxygen. Iron is an important component of hemoglobin.
Hemoglobin is the compound in red blood cells that carries oxygen from the lungs to body cells. The oxygen combines readily with the ion in hemoglobin, and hemoglobin can carry more than twenty times its own volume in oxygen. After releasing oxygen to the cells, hemoglobin collects carbon dioxide and carries it to the lungs where it is exhaled.
Hemoglobin
The hemoglobin or "red cells".
Aluminum
Hemoglobin is the protein in red blood cells that carries oxygen. It contains iron as one of its chief components.
Red blood cells
Haemoglobin combines with oxygen, enabling blood to carry 70 times more than if the oxygen were simply dissolved.
Heme is what keeps iron from rusting in our blood, which combines with globin to make hemoglobin, which is the thing in our red blood cells that carries oxygen.