Answer:
An iron atom located on the heme portion of hemoglobin
Explanation:
Oxygen is attached to an iron atom located on the heme portion of hemoglobin.
Hemogoblin is a protein present in the red blood cells of several vertebrates. The main function of this protein is to transport oxygen through blood. The heme portion consists of an organic cyclic compound that contains 4 nitrogen atoms, which bond to an iron atom.
