The non-protein component of haemoglobin and certain other biological molecules is made up of hem, an iron-containing chemical of the porphyrin class.
A precursor of haemoglobin, heme, or haemis is required to bind oxygen in the bloodstream.
Both the liver and bone marrow can biosynthesize heme.
The part of certain molecules that contains iron.
Red blood cells include a chemical called heme, which is a component of haemoglobin, which binds to oxygen in the lungs and transports it to the tissues.
The blood's haemoglobin, a respiratory pigment, contains heme.