Blood vessels have what type of nerve supply?

Blood vessels have what type of nerve supply?

• A. Sympathetic
• B. Parasympathetic
• C. Somatic
• D. Visceral sensory

Answer: (A)

Blood vessels are controlled by the autonomic nervous system, with the main vasomotor control coming from the sympathetic nerves. Sympathetic postganglionic fibers release norepinephrine that acts on vascular smooth muscle to adjust constriction and, consequently, blood flow and pressure. Parasympathetic input to most vessels is minimal or absent, so it isn’t the primary nerve supply. Somatic nerves don’t innervate vascular smooth muscle, and visceral sensory fibers carry information about the vessels rather than regulating their tone. So the sympathetic system is the primary nerve supply to blood vessels.

Blood vessels are controlled by the autonomic nervous system, with the main vasomotor control coming from the sympathetic nerves. Sympathetic postganglionic fibers release norepinephrine that acts on vascular smooth muscle to adjust constriction and, consequently, blood flow and pressure. Parasympathetic input to most vessels is minimal or absent, so it isn’t the primary nerve supply. Somatic nerves don’t innervate vascular smooth muscle, and visceral sensory fibers carry information about the vessels rather than regulating their tone. So the sympathetic system is the primary nerve supply to blood vessels.