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CAIE A-Level Biology 8.2.6 Bohr Shift and Oxygen Delivery

Practise linking increased CO₂ and lower pH to a right-shifted dissociation curve, reduced haemoglobin affinity and greater oxygen unloading in active tissues.

Syllabus
2028–2030
Course
Biology 9700
Level
AS

Exam points

  • link higher carbon dioxide with more hydrogen ions and lower red-cell pH
  • explain reduced haemoglobin oxygen affinity as a rightward dissociation-curve shift
  • connect easier unloading with increased oxygen supply to actively respiring tissues

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