what is the role of erector Pili
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they are small muscles attached to hair follicles in mammals
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The arrector pili muscles are small muscles attached to hair follicles in mammals. Contraction of these muscles causes the hairs to stand on end, known colloquially as goose bumps. ... Pressure exerted by the muscle may cause sebum to be forced along the hair follicle towards the surface, protecting the hair.
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