Which of the Following is Most Likely to Induce a Reflex

Question

Which of the following is most likely to induce a reflex bradycardia?
A) Development of hypovolemic (low blood volume) shock, as in hemorrhage
B) Exertion of pressure over the carotid sinus (tight collar)
C) Administration of nitroglycerine (a vasodilator drug)
D) Administration of a diuretic for hypertension

Accepted Answer

Exertion of pressure over the carotid sinus, which is located in the neck and helps regulate heart rate and blood pressure, is known to induce reflex bradycardia. Other stimuli that can induce reflex bradycardia include pain, emotional stress, and certain medications. However, of the options given, B is the most likely to induce reflex bradycardia.