Multiple choice

Oxyhaemoglobin is dissociated into oxygen and deoxyhaemoglobin due to

  1. excess of O2 pressure in tissues

  2. less of O2 pressure in tissues

  3. less of O2 pressure in blood

  4. less of CO2 pressure in blood
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Oxyhaemoglobin dissociates to release oxygen in tissues where oxygen partial pressure is low. This pressure gradient drives oxygen from hemoglobin into tissues. In lungs, high O2 pressure promotes oxygen binding.

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