The most important factor in determining the respiratory rate is: A) arterial pCO_2. B) arterial pO_2. C) alveolar pCO_2. D) alveolar pO_2.

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The most important factor in determining the respiratory rate is the arterial partial pressure of carbon dioxide (pCO2). Changes in arterial pCO2 directly influence the respiratory centers in the brain, leading to adjustments in the rate and depth of breathing to maintain homeostasis.

The Most Important Factor in Determining the Respiratory Rate Is