Why does human skin hair stand up?
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The root of the hair is attached to the body by some small muscles. In normal conditions, there is no tension. These muscles contract as a physical response to cold, fear, etc. As a result, a tense condition is created due to which the hairs fall out.
webmd Our hair is on a muscle. When particularly excited about something, those muscles contract and the hairs stand up. Music can chill our spines and give them goosebumps. According to new research, this may mean we experience more intense emotions. Goosebumps are actually part of our fight or response. It can be linked to the release of dopamine hormone in our brain