When carbon dioxide pressure increases, the capacity of haemoglobin to hold oxygen:
Correct answer: B. Decreases
- A. Increases many folds
- B. Decreases
- C. Remains constant
- D. Is doubled
Explanation
Since CO2 reacts with water to form carbonic acid, an increase in CO2 results in a decrease in blood pH resulting in haemoglobin proteins releasing their loads of oxygen. Conversely a decrease in CO2 provokes an increase in pH, which results in haemoglobin picking up more oxygen.
This question appeared on the UHS MDCAT 2008 paper, which you can sit online with every answer explained.
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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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