PART 2: The Muscle That Creates Goosebumps (And Why You Can't Control It) Now for the structure that actually MAKES goosebumps happen. THE ARRECTOR PILI MUSCLE: "Arrector" = lifts, "pili" = hair. This tiny muscle attaches from the upper dermis down to the base of each hair follicle. HOW IT WORKS: At rest: hair follicle sits at an angle less than 90° When contracted: muscle pulls the follicle base upward, straightening the hair vertically AND creating a little bump/protrusion in the skin Result:

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