- A A rise in blood pH, since less carbonic acid is formed
- B Increased binding of CO2 to haemoglobin as carbaminohaemoglobin
- C No change in pH, since CO2 does not affect blood acidity
- D A fall in blood pH, due to excess bicarbonate accumulation
Correct answer: A. A rise in blood pH, since less carbonic acid is formed
Explanation: Excessive removal of CO2 during hyperventilation reduces carbonic acid formation in blood, raising blood pH (respiratory alkalosis).
Concept context
The mechanics of breathing, lung volumes, gas transport in blood, the Bohr effect, and respiratory regulation.