Multiple choice

Oxyhaemoglobin is dissociated into oxygen and deoxyhaemoglobin due to _______.

  1. excess of O2 pressure in tissues

  2. lack of O2 pressure in tissues

  3. lack of O2 pressure in blood

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

Oxyhaemoglobin releases oxygen in tissues because tissue cells are constantly consuming oxygen for cellular respiration, creating a low partial pressure environment (low pO2) that favors dissociation. This oxygen delivery mechanism is essential for supplying oxygen to metabolically active tissues.

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