The graph below shows oxygen dissociation curves for the haemoglobin of a mother and her...

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The graph below shows oxygen dissociation curves for the haemoglobin of a mother and her foetus Which one of the following statements describes the difference in the behaviour of the two types of haemoglobin 100 Percentage saturation of haemoglobin with oxygen 90 80 70 60 50 40 30 20 10 0 20 0 A fetus B mother C 2 6 8 10 12 14 16 Partial pressure of oxygen po kPa O a Both foetal and adult haemoglobin carry the same amount of oxygen per mole of haemoglobin O b Adult haemoglobin cannot carry as much oxygen as foetal haemoglobin O c Foetal haemoglobin cannot carry as much oxygen as adult haemoglobin O d Foetal haemoglobin has a higher oxygen affinity than adult haemoglobin Adult haemoglobin has a higher oxygen affinity than foetal haemoglobin

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