During exercise, increased respiratory rate helps eliminate CO2 buildup, which can lead to increased acidity in the body. Breathing harder during exercise is not primarily for oxygen intake but to expel CO2. Inhaling increases heart rate as a sympathetic response to prepare for oxygen delivery, while exhaling decreases heart rate as a parasympathetic response to avoid hyperventilation. Maintaining the balance of CO2 levels is crucial to prevent respiratory alkalosis.

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