Answer:
When blood vessels are innervated they respond by contracting and relaxing their muscle wall, as a result of the activity of the autonomic nervous system.
Explanation:
The nerves that are responsible for the innervation of the blood vessels are called nervi vasorum, and are composed of nerve fibers of the sympathetic and parasympathetic nervous systems.
The innervation of the blood vessels specifically acts on the muscular wall of the vessel, so it contracts or relaxes depending on the activity of the nervous system:
- Sympathetic nervous system stimulates vascular contraction.
- Parasympathetic nervous system makes the vascular smooth muscle relax.
The action of the autonomic nervous system has an effect on blood pressure, being a determinant of normal or pathological behavior of the arteries.
