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Goose bumps
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=== Extreme temperatures === Goose bumps can be experienced in the presence of flash-cold temperatures, for example being in a cold environment, and the skin being able to re-balance its surface temperature quickly. The stimulus of cold surroundings causes the tiny muscles ([[arrector pili muscle]]) attached to each [[hair follicle]] to contract. This contraction causes the hair strands to stand straight, the purpose of which is to aid in quicker drying via evaporation of water clinging to the hair which is moved upward and away from the skin.{{Citation needed|reason=This seems unlikely in humans (Adhesion and cohesion would net let water move upward/away from the skin along a thin hair. It's more likely the erection is due to vestigial reflexes as outlined in other parts of the article.|date=June 2018}}
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