Baroreceptors A) are found in all arterioles and sense plasma levels of CO₂. B) affect respiratory rate. C) monitor [H⁺] and therefore regulate blood pH. D) are located in the carotid sinus and aortic arch and sense changes in blood pressure.

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Baroreceptors are located in the carotid sinus and aortic arch and sense changes in blood pressure. They play a role in regulating blood pressure by sending signals to the brain to adjust heart rate and blood vessel diameter accordingly.