Which of the following is true of vasoconstriction?
A)Caused by parasympathetic nerve stimulation
B)Increases SVR
C)Caused by vagal discharge
D)Generally accompanied by arteriolar dilation

Question

Quizplus · Accepted Answer

Vasoconstriction is the narrowing of blood vessels, which increases resistance to blood flow and leads to an increase in systemic vascular resistance (SVR). It is primarily caused by sympathetic nerve stimulation, which releases norepinephrine and causes smooth muscle contraction in the vessel walls. Parasympathetic nerve stimulation and vagal discharge are associated with vasodilation, not vasoconstriction. Vasoconstriction is not generally accompanied by arteriolar dilation, as these two processes have opposite effects on blood vessel diameter.

Which of the Following Is True of Vasoconstriction