The sympathetic nervous system causes
A)blood vessels with alpha receptors to dilate
B)bronchioles to constrict
C)pupils of the eye to dilate
D)sweat glands to be inhibited
E)the urinary bladder to contract and eliminate urine

Question

Quizplus · Accepted Answer

The sympathetic nervous system causes the pupils of the eye to dilate through activation of alpha-1 receptors in the radial muscle of the iris. This allows more light to enter the eye, which can improve visual acuity in dark or dimly lit environments. None of the other options are correct. Alpha receptors on blood vessels are actually involved in vasoconstriction, bronchioles are dilated by activation of beta-2 receptors, the sympathetic nervous system stimulates sweat gland secretion, and the urinary bladder is actually relaxed by sympathetic activation.

The Sympathetic Nervous System Causes