At the pO₂ in the lungs, haemoglobin is

  1. about 50% saturated
  2. saturated with CO₂
  3. nearly fully saturated
  4. unable to bind oxygen
Answer

C) nearly fully saturated

High pO₂ gives about 97% saturation. AS & A Level Biology · Topic 8 Transport in Mammals · 8.2 Transport of oxygen and carbon dioxide

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