An increase in carbon dioxide generally causes what change in respiratory rate?

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Multiple Choice

An increase in carbon dioxide generally causes what change in respiratory rate?

Rising carbon dioxide levels push ventilation up. CO2 crosses into the cerebrospinal fluid, forms carbonic acid, and lowers pH. Central chemoreceptors in the medulla detect this acidosis and drive the respiratory centers to increase both the rate and depth of breathing, blowing off CO2 and restoring pH. In normal physiology, CO2 is the main driver of the respiratory rate, so when CO2 rises, the rate increases to compensate. That’s why the best choice is an increase. A decrease or no change would ignore this chemoreceptor response, and a decrease-then-increase pattern doesn’t fit how CO2-driven ventilation works.

Rising carbon dioxide levels push ventilation up. CO2 crosses into the cerebrospinal fluid, forms carbonic acid, and lowers pH. Central chemoreceptors in the medulla detect this acidosis and drive the respiratory centers to increase both the rate and depth of breathing, blowing off CO2 and restoring pH. In normal physiology, CO2 is the main driver of the respiratory rate, so when CO2 rises, the rate increases to compensate. That’s why the best choice is an increase. A decrease or no change would ignore this chemoreceptor response, and a decrease-then-increase pattern doesn’t fit how CO2-driven ventilation works.

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