May/June 2026 Paper 11

2026 · 40 questions · 40 parts · 40 marks

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31Blood Clotting Oxygen TransportHard1 mark
The graph shows the oxygen dissociation curves of haemoglobin for eight species of mammal.
Graph of percentage oxygen saturation of haemoglobin (vertical axis, 0 to 100) against partial pressure of oxygen in kPa (horizontal axis, 0 to 14), with eight numbered oxygen dissociation curves (1 to 8) positioned from furthest left (1) to furthest right (8).
Key: mammals in decreasing order of size.
  1. 1
    elephant
  2. 2
    horse
  3. 3
    human
  4. 4
    sheep
  5. 5
    fox
  6. 6
    cat
  7. 7
    rat
  8. 8
    mouse
What can be concluded from the data shown in the graph?