Neuroreceptors that wrap around some large arteries and sense pressure changes in them, especially in the aorta and carotid arteries.

• A. Chemoreceptors
• B. Proprioceptors
• C. Mechanoreceptors
• D. Baroreceptors

Answer: (D)

Baroreceptors are specialized mechanoreceptors that monitor arterial pressure by sensing stretch in the vessel walls. They are located in the walls of large arteries, especially the carotid sinus and the aortic arch, so they wrap around these vessels to detect changes in pressure. When blood pressure rises, the arterial wall stretches more, increasing baroreceptor firing; when it falls, the firing decreases. This information is sent to the brainstem to adjust heart rate and vascular tone, providing quick, short-term blood pressure regulation. The other options don’t fit as well: chemoreceptors respond to chemical changes like O2, CO2, or pH; proprioceptors sense body position or movement; mechanoreceptors is a broad category that doesn’t specify the arterial location and BP-sensing role.