Which statement explains why the oxygen dissociation curve for haemoglobin is S-shaped?
1 )
At high oxygen concentrations, oxygen dissociates from the haemoglobin molecule.
2 )
Haemoglobin becomes saturated at low partial pressures of oxygen.
3 )
Oxygenated haemoglobin accepts hydrogen ions from carbonic acid.
The shape of the haemoglobin molecule changes when oxygen binds to it.
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