The graph shows the oxygen dissociation curves of adult haemoglobin at two partial pressures of carbon dioxide W and X.
Which pair of statements are correct?
1 Curve W shows the oxygen dissociation curve at a higher concentration of carbon dioxide than curve X.
2 Curve X shows the oxygen dissociation curve at a higher concentration of carbon dioxide than curve W.
3 At a partial pressure of oxygen of 7.0 kPa the haemoglobin from curve W has a higher affinity for oxygen than haemoglobin from curve X.
4 At a partial pressure of oxygen of 7.0 kPa the haemoglobin from curve X has a higher affinity for oxygen than haemoglobin from curve W.
1 )
1 and 3
1 and 4
3 )
2 and 3
4 )
2 and 4
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