Arrector pili muscle

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Notion

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Science and technology

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What Wikipedia says

The arrector pili muscles, also known as hair erector 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 (piloerection).

Excerpt from the Wikipedia article “Arrector pili muscle”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Kilbad, Public domain, via Wikimedia Commons.