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arrector pili


'arrector pili' can also refer to...

 

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A small muscle in the dermis of the skin that is attached to the base of a hair follicle. Contraction of the arrector pili, in response to cold or fear, pulls the hair into a vertical position, thus trapping an insulating layer of air around the body and causing ‘goose flesh’ in humans.

Subjects: Biological Sciences — Medicine and Health.


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