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The ______ ______ muscles contract to raise the hair shafts to use the body hair to trap heat
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The ______ ______ muscles contract to raise the hair shafts to use the body hair to trap heat

User Jamie McAllister
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Answer:

The arrector pili muscles contract (piloerection) and lift the hair follicles upright. This makes the hairs stand on end, which acts as an insulating layer, trapping heat.

User Javier Lopez Tomas
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