A-LevelBiologyGas exchange9700/12 · May/June 2014 · Q281 Mark
The graph shows the percentage saturation of haemoglobin with oxygen at different partial pressures of oxygen and two different concentrations of carbon dioxide. [Figure 28.1] What is the effect of increasing the concentration of carbon dioxide?
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AIt increases the affinity of haemoglobin for oxygen at respiring tissues.
BIt increases the dissociation of haemoglobinic acid inside red blood cells.
CIt increases the dissociation of oxygen from haemoglobin at respiring tissues.
DIt increases the inhibition of carbonic anhydrase enzyme in red blood cells.
✓ Correct answer
C: It increases the dissociation of oxygen from haemoglobin at respiring tissues.
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