Arrector Pili Muscle - this is a tiny muscle that attaches to the base of a hair follicle at one end and to dermal tissue on the other end. In order to generate heat when the body is cold, the arrector pili muscles contract all at once, causing the hair to "stand up straight" on the skin.
What is the function of the hair erector in the human body?
It causes your hair to "stand on end". As for exactly how and why, go to the two references below; they're excellent.
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