Goosebumps are something your body does automatically when you’re feeling strong emotions like fear, excitement, or even when you’re cold. It’s controlled by a part of your nervous system that you can’t directly control, called the autonomic nervous system.
The reason why we get goosebumps goes way back to our ancient ancestors and even to animals with lots of hair or fur. When these animals get cold, their fur stands up to trap more air. This air acts like insulation, helping them stay warm. Or, if they’re scared or need to look bigger to scare off enemies, their fur puffs up.
Humans don’t have much body hair, but we still have tiny muscles at the base of each hair that can make the hair stand up. When these muscles pull the hairs up, we get goosebumps.
So, goosebumps are like a leftover trait from when our far-off ancestors had a lot more body hair. Even though we don’t need them much today, our bodies still react this way when we’re chilly or experiencing strong emotions.
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