参考答案:
Rapidly respiring tissues produce carbon dioxide.
Rapidly respiring tissues need a greater amount of oxygen.
Carbon dioxide diffuses into the blood.
Carbon dioxide attaches to an allosteric site on haemoglobin.
Lowering haemoglobin affinity for oxygen.
Causing greater release of oxygen to rapidly respiring tissues.
This ensures that (areas of the body with) rapidly respiring tissues are supplied with more oxygen.
The phenomenon is known as the Bohr shift.
Note – a graph showing any of the above points should be given credit.
Award one mark for each point, six of the points are required for six mark
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