![Diagram of a haeme molecule with iron atom.](http://static.sciencelearn.org.nz/images/images/000/002/144/full/Haemoglobin-structure20161004-21075-1730f63.jpg?1674167705)
Iron is an essential trace element. It forms part of a haeme molecule that is embedded in a larger protein molecule. The iron part of haeme can bind oxygen to itself.
Iron is an essential trace element. It forms part of a haeme molecule that is embedded in a larger protein molecule. The iron part of haeme can bind oxygen to itself.