The bundle of smooth muscles associated with hair follicles is called what?
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Contraction of these muscles causes the hairs to stand on end, known colloquially as goose bumps. Each arrector pili is composed of a bundle of smooth muscle fibres which attach to several follicles (a follicular unit), and is innervated by the sympathetic branch of the autonomic nervous system.
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Sympathetic postganglionic nerve fibers...
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