What effect does the sympathetic nervous system have on the diameter of blood vessels?
A) vasodilation
B) no effect
C) vasoconstriction
D) vasodilation, then vasoconstriction

Question

Quizplus · Accepted Answer

The sympathetic nervous system causes vasoconstriction of blood vessels. This is due to the release of norepinephrine from sympathetic nerve endings, which binds to alpha-adrenergic receptors on the smooth muscle cells in the wall of the blood vessels, causing them to contract. This narrowing of the blood vessels helps to increase blood pressure and redirect blood flow to vital organs during times of stress or exercise.

What Effect Does the Sympathetic Nervous System Have on the Diameter