The capacity of oxyhaemoglobin to release oxygen at tissue level is MAINLY dependent on:
Correct answer: C. Higher pressure of carbon dioxide in blood
- A. High concentration of oxygen in blood
- B. Lower pressure of nitrogen in atmosphere
- C. Higher pressure of carbon dioxide in blood
- D. Low temperature of body in cold environment
Explanation
The correct answer is Option C:higher pressure of carbon dioxide in blood.This is because an increase in carbon dioxide levels in the blood lowers pH, leading to the Bohr effect, which facilitates the release of oxygen from oxyhaemoglobin to the tissues.
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About Gaseous Exchange in Lungs
Gaseous exchange in the lungs occurs across the thin, moist alveolar and capillary surfaces, where oxygen and carbon dioxide diffuse down partial pressure gradients. The topic covers alveolar adaptations, ventilation, the role of haemoglobin in oxygen transport, carbon dioxide carriage, and the difference between external gas exchange and cellular respiration.
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