Which receptors in the carotid sinus respond to arterial pressure changes?

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The carotid sinus houses specialized stretch-sensitive nerve endings called baroreceptors. These receptors detect how much the arterial wall is stretched when blood pressure rises. When pressure increases, the walls stretch more and the baroreceptors fire more rapidly. This information travels to the brainstem and triggers reflexes that lower blood pressure by slowing the heart rate and causing vasodilation, helping to maintain stable blood pressure. If pressure drops, firing decreases, and the opposite reflexes raise blood pressure.

Chemoreceptors in the carotid body sense chemical changes like oxygen, carbon dioxide, and pH, not mechanical stretch. Mechanoreceptors is a broad category of sensors for mechanical stimuli, but in this context the receptors in the carotid sinus that respond to pressure changes are specifically baroreceptors, the stretch-sensitive type.