Under what conditions is the arrector pili muscle stimulated? what part of the brain would produce an efferent signal to this smooth muscle effector?

The pili arrector muscle, or erector muscle of the hair, is a muscle composed of smooth muscle fibers which is innervated by the sympathetic nervous system (SNS). When the hair is erect, what is known as "goosebumps" is produced; This action is involuntary and can be caused by fear, cold, among others. The efferent signals to activate this muscle come from the hypothalamus, brain stem and spinal cord.

answer:

a licensed practical nurse (lpn), in much of the united states and canada, is a nurse who cares for people who are sick, injured, convalescent, or disabled. in the united states, lpns work under the direction of physicians.

explanation:

answer:

it could come from a variety of sources.

explanation:

..although it was most likely developed through zoonotic transmission, where an infectious disease which usually afflicts when animals jump to humans.