What is an arrector pili muscle associated with?

The arrector pili muscle is a small, smooth muscle that is directly attached to hair follicles in the skin. When these muscles contract, they cause the hair to stand up, resulting in what is often referred to as "goosebumps." This reaction can occur in response to cold temperatures or emotional stimuli, as it is part of the body's natural response mechanisms.

The function of the arrector pili muscle relates specifically to its attachment to hair follicles, distinguishing it from other structures or functions in the skin. This is why the correct choice highlights its association with hair follicles rather than other features or functions related to skin or nails. Understanding this muscle's role is important for grasping the physiological responses related to body temperature regulation and emotional reactions.