The Bohr shift describes how

  1. temperature has no effect
  2. high CO₂ concentration lowers haemoglobin's affinity for oxygen
  3. low CO₂ lowers affinity
  4. chloride ions raise affinity
Answer

B) high CO₂ concentration lowers haemoglobin's affinity for oxygen

Curve shifts right with more CO₂. AS & A Level Biology · Topic 8 Transport in Mammals · 8.2 Transport of oxygen and carbon dioxide

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