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Gorilla1969 t1_j8zypsq wrote

If we still had a thick coat of hair, like our distant ancestors, something that spooked us would cause our hair to stand on end, which would make us look a little bigger and more intimidating. Look closely at the hair on your arm the next time you get that chill.

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ExodusRex t1_j90l18g wrote

Is it called pillory response? Kinda neat how we lost our hair but kept the fine muscles to bristle the hair to make us look bigger and protect us through a show of implied dominance. What other vestigial traits does the human animal have? Fascinating.

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ImproperCommas t1_j90byaj wrote

But we should heat up. The ‘chills’ also refers to a feeling of coldness on one’s back or their arms.

You get the the ‘chills’ from the sudden sharp decrease in blood flow to the outer layer of your skin. Less blood flow means less heat and thus you feel very cold, very rapidly.

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