May/June 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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32Blood Clotting Oxygen TransportMedium1 mark
The graph shows the oxygen dissociation curve for adult human haemoglobin.
Figure 32, the oxygen dissociation curve for adult human haemoglobin: a sigmoid curve plotted with an unlabelled y-axis from 0 to 100 against an unlabelled x-axis from 0 to 12. A point marked 1 lies low on the curve (around x = 1.5, y = 18); a point marked 2 lies near the plateau (around x = 11, y = 97).
What is correct for this dissociation curve?
axis labelled "partial pressure of oxygen / kPa"point where haemoglobin is most saturated with oxygen
Ax-axis1
Bx-axis2
Cy-axis1
Dy-axis2