The arrector pili muscle contracts and pulls hairs upright when we are cold or frightened.

Question

Quizplus · Accepted Answer

This is true. The arrector pili muscle is a small, involuntary muscle that is attached to each hair follicle on our skin. When it contracts, it causes the hair to stand upright, which can create a layer of insulation to help us retain body heat when we are cold. It can also create the appearance of "goosebumps" when we are frightened or experiencing strong emotions.

The Arrector Pili Muscle Contracts and Pulls Hairs Upright When