We all know the feeling, horror movies, ominous music, a strange noise outside at night. Why would your body react this way?
In: Biology
Arrector pili muscle makes all the individual hair follicles on your body stand out, supposed to make animals look bigger. Byproduct of evolution
Body muscles contract in quick bursts to generate heat and your hypothalamus triggers a rush of adrenaline. As the tiny muscles attached to each of your hairs tighten, the hairs shoot straight into the air, pulling the skin at their base upward. Goosebumps.
Probably vestigial reaction to danger to increase chances of surviving.
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