In the Henderson-Hasselbalch depiction, which component represents the respiratory control of pH?

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Multiple Choice

In the Henderson-Hasselbalch depiction, which component represents the respiratory control of pH?

In the Henderson-Hasselbalch depiction, pH depends on the ratio of bicarbonate to dissolved CO2. The respiratory system controls CO2 levels in blood, so pCO2 embodies respiratory influence on pH. When ventilation increases, pCO2 falls and pH rises (respiratory alkalosis); when ventilation decreases, pCO2 rises and pH falls (respiratory acidosis). CO2 is a volatile acid and responds quickly to changes in respiration, while bicarbonate is regulated by the kidneys and changes more slowly, representing metabolic control. PO2 or O2 content don’t directly determine the pH in this framework.

In the Henderson-Hasselbalch depiction, pH depends on the ratio of bicarbonate to dissolved CO2. The respiratory system controls CO2 levels in blood, so pCO2 embodies respiratory influence on pH. When ventilation increases, pCO2 falls and pH rises (respiratory alkalosis); when ventilation decreases, pCO2 rises and pH falls (respiratory acidosis). CO2 is a volatile acid and responds quickly to changes in respiration, while bicarbonate is regulated by the kidneys and changes more slowly, representing metabolic control. PO2 or O2 content don’t directly determine the pH in this framework.

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