A Tight Collar Might Trigger the Baroreceptor Reflex Because The

Question

A tight collar might trigger the baroreceptor reflex because the
A) carotid baroreceptors sense a change in the osmolarity of the blood flowing through the carotid arteries.
B) carotid baroreceptors interpret the elevated carotid pressure as an elevation of blood pressure.
C) tight collar occludes blood flow to the brain, causing cerebral artery spasms.
D) tight collar impairs drainage of cerebral venous blood, causing cerebral edema.

Accepted Answer

The baroreceptor reflex responds to changes in blood pressure detected by baroreceptors located in the carotid sinus and aortic arch. When blood pressure increases, baroreceptors send signals to the brain to decrease sympathetic nervous system activity and increase parasympathetic nervous system activity, resulting in vasodilation and decreased heart rate, which lowers blood pressure. A tight collar can stimulate the baroreceptor reflex by putting pressure on the carotid sinus, which is located in the neck near the collarbone. The baroreceptors in the carotid sinus may interpret the pressure as an elevation in blood pressure, triggering the reflex.