A-LevelBiologyGas exchange9700/12 · May/June 2015 · Q301 Mark
What does not help to maximise uptake of oxygen as blood flows through capillaries in the lungs?
ADissociation of carbon dioxide from carboxyhaemoglobin allows more haemoglobin to be available for oxygen binding.
BEach haemoglobin molecule can temporarily bind to eight oxygen atoms.
COxyhaemoglobin formation increases the capacity of red blood cells to transport oxygen.
DThe binding of the first oxygen molecule to haemoglobin increases the molecule's affinity for binding other oxygen molecules.
✓ Correct answer
A: Dissociation of carbon dioxide from carboxyhaemoglobin allows more haemoglobin to be available for oxygen binding.
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