The graph shows the effect of three different partial pressures of carbon dioxide on the oxygen dissociation curve for human haemoglobin.
What effect does decreasing the partial pressure of carbon dioxide have on haemoglobin?

1 )
It is less efficient at taking up oxygen and less efficient at releasing oxygen.
2 )
It is less efficient at taking up oxygen and more efficient at releasing oxygen.
It is more efficient at taking up oxygen and less efficient at releasing oxygen.
4 )
It is more efficient at taking up oxygen and more efficient at releasing oxygen.
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