Reflex that maintains appropriate blood pressure by responding to changes in pressure in the aorta and carotid arteries is called what?

Reflex that maintains appropriate blood pressure by responding to changes in pressure in the aorta and carotid arteries is called what?

• A. Baroreceptor Reflex
• B. Cardiac Cycle
• C. Venous Return
• D. Chemoreflex

Answer: (A)

Baroreceptor reflexes are the rapid monitoring system for blood pressure, using sensors in the carotid sinus and aortic arch that detect how stretched the arterial walls are. When pressure rises, these baroreceptors fire more quickly and send signals to the brainstem. The brain then shifts autonomic output to slow the heart and dilate vessels: increased parasympathetic (vagal) activity lowers heart rate and contractility, while reduced sympathetic activity lessens vascular tone. The result is a drop in blood pressure back toward normal. If blood pressure falls, the baroreceptors fire less, and the opposite autonomic adjustments occur to raise it again. This mechanism works in real time to keep BP stable on a moment-to-moment basis. Other options aren’t about sensing arterial stretch: the cardiac cycle is just the heart’s pumping sequence, venous return is about blood flowing back to the heart, and the chemoreflex responds to chemical changes like CO2, O2, and pH rather than pressure.

Baroreceptor reflexes are the rapid monitoring system for blood pressure, using sensors in the carotid sinus and aortic arch that detect how stretched the arterial walls are. When pressure rises, these baroreceptors fire more quickly and send signals to the brainstem. The brain then shifts autonomic output to slow the heart and dilate vessels: increased parasympathetic (vagal) activity lowers heart rate and contractility, while reduced sympathetic activity lessens vascular tone. The result is a drop in blood pressure back toward normal. If blood pressure falls, the baroreceptors fire less, and the opposite autonomic adjustments occur to raise it again. This mechanism works in real time to keep BP stable on a moment-to-moment basis. Other options aren’t about sensing arterial stretch: the cardiac cycle is just the heart’s pumping sequence, venous return is about blood flowing back to the heart, and the chemoreflex responds to chemical changes like CO2, O2, and pH rather than pressure.