Your questions is alot like asking why for example the atmosphere requires ozone. True it's properties affect the way sunlight enters the earth, and therefore life on earth, but it has an implicit "chicken or the egg" conundrum quality. The answer to "What is Iron's role in Haemoglobin's oxygen transport capabilities?", is related to Irons valency (Outer electrons, different oxidation states and energy setups)and the way it takes up and releases oxygen under different oxygen concentrations (when it is associated with the rest of the protien.
Because of the iron/ it is iron that bonds to the oxygen and also makes the RBCs red
Carbaminohemoglobin
Oxygen
Hemoglobin transports gasses around the body. Hemoglobin contains iron and other minerals. It forms HbO8 and HbCO2 when bond with gasses.
It is called hemoglobin. Hemoglobin carries oxygen and iron to the tissues.
You have Iron atoms in hemoglobin. This atom is the binding site for oxygen in case of hemoglobin.
coordinated bond (covalent)
The rise of temperature denatures the bond between oxygen and hemoglobin.
CO
Carbaminohemoglobin
Oxygen
A decrease in pH (acidosis) weakens the hemoglobin-oxygen bond.
there is an inability for Oxygen to properly bond to the Hemoglobin molecules in the damaged cell
Oxygen in the blood is transported by hemoglobin.
hemoglobin
Hemoglobin transports gasses around the body. Hemoglobin contains iron and other minerals. It forms HbO8 and HbCO2 when bond with gasses.
It is called hemoglobin. Hemoglobin carries oxygen and iron to the tissues.
You have Iron atoms in hemoglobin. This atom is the binding site for oxygen in case of hemoglobin.