A-LevelBiologyGas exchange9700/12 · Feb/Mar 2016 · Q291 Mark
Which reactions take place at a higher rate in a capillary in an alveolus than in a capillary in active muscle? 1 carbon dioxide + water → carbonic acid 2 carbon dioxide + haemoglobin → carboxyhaemoglobin 3 haemoglobin + hydrogen ions → haemoglobinic acid 4 hydrogencarbonate ions + hydrogen ions → carbon dioxide + water
A1 and 2
B3 and 4
C1 only
D4 only
✓ Correct answer
D: 4 only
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