What type of nerves are responsible for moving blood vessels and arrector pili muscles in the skin?

The correct choice highlights the role of motor nerves, which are responsible for transmitting signals from the central nervous system to various muscles in the body, including those associated with blood vessels and arrector pili muscles in the skin. These motor nerves facilitate essential functions, such as regulating blood vessel diameter and controlling hair erection (piloerection) in response to various stimuli.

In particular, the arrector pili muscles respond to emotional stimuli or cold temperatures, contracting to cause the hair to stand on end, a response that is directly controlled by motor nerves. Similarly, the constriction and dilation of blood vessels, important for thermoregulation and blood flow, are also functions mediated by motor nerves.

The other types of nerves do serve significant roles in the body, but they do not primarily control the movement of muscles. Sensory nerves are responsible for conveying signals about touch, pain, and temperature from the skin to the brain. Sympathetic nerves are part of the autonomic nervous system and are primarily involved in the fight-or-flight response, which can influence blood vessels indirectly, but they do not directly control the movement of muscles. Parasympathetic nerves are also part of the autonomic nervous system, managing rest and digest processes, but again do not