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CAIE A-Level Biology 2.3.7 Haemoglobin Function and Iron

Practise explaining how each haem Fe²⁺ ion binds one oxygen molecule reversibly, enabling loading at high partial pressure and unloading where partial pressure is lower.

Syllabus
2028–2030
Course
Biology 9700
Level
AS

Exam points

  • identify Fe²⁺ within each haem group as the site that binds an oxygen molecule
  • state that oxygen binding is reversible so loading and unloading can occur
  • avoid assigning carbon-dioxide binding to the iron ion when explaining haem function

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