A decrease in the autonomic tone of the smooth muscle in a blood vessel would result in
A)an increase in vessel diameter.
B)a decrease in vessel diameter.
C)oscillation in vessel diameter.
D)an increase in blood flow through the vessel.
E)both an increase in vessel diameter and an increase in blood flow through the vessel.

Question

Quizplus · Accepted Answer

A decrease in autonomic tone typically leads to vasodilation, or an increase in vessel diameter, because the autonomic nervous system (particularly the sympathetic division) often acts to constrict blood vessels. An increase in vessel diameter reduces resistance to blood flow, thereby increasing blood flow through the vessel.

A Decrease in the Autonomic Tone of the Smooth Muscle