A marathon runner's blood pH drops significantly during a race. Which compensatory mechanism helps restore blood pH homeostasis?

💡 Explanation

Increased ventilation removes excess CO2 from the blood, thereby reducing carbonic acid levels and increasing pH toward normal because hyperventilation decreases the partial pressure of carbon dioxide. Therefore, increasing ventilation is the appropriate response, rather than conserving CO2 or relying on lactate, which contributes to acidity.

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