Oxygen is carried round the body by haemoglobin.
1. Red blood cells contain haemoglobin.
2. It's a large protein with a quaternary structure - it's made up of four polypeptide chains.
3. Each chain has a haem group which contains iron and gives haemoglobin its red colour.
4. It has a high affinity for oxygen - each molecule can carry four oxygen molecules.
5. in the lungs, it joins to oxygen to form oxyhaemoglobin.
6. This is a reversible reaction - oxygen dissociates from it near the body cells and turns it back to haemoglobin.
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