the arector pili muscle.
If you have goosebumps
Goosebumps.
Goosebumps.
skin
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goosebumps are when you have lattes of little bumps on your skin
you get goosebumps.
we all get goosebumps when it is cold because your skin sqeezes together to keep heat inside your body
Goosebumps can only form where you have hair follicles. The bump is formed by the muscle causing the hair to stand up straight when you are cold or scared or whatever else causes you to get goosebumps. But on hairless areas of your body, you will not get goosebumps.
It depends on what kind-- Goosebumps, well, is when your either cold or afraid.
There are many many many ways to get goosebumps, one of the more common ways is when you are cold. Goosebumps are really tiny muscles in your skin contracting, making the skin bunch up that surround the hair, which result in goosebumps. The body preserves heat this way, which is why the hairs stand up, thus reducing heat loss. :)
Adrenaline stimulates tiny muscles to pull the roots of our hairs, thereby making them stand up on our skin.