Well when you get the chills which is a felling of happyness, excitement or anything that gives you the chills, your brain is sending signals through your motor neurons in the CNS (Central Nervous Sysytem) to your arrector pili muscles which are attached to your hair folicals which causs the hair to stick straight up, therefor causing the chill sensation. Now when you get the goose bumps, the same thing happens only it goes the other way. Your sensory neurons recieves information from either the external or internal environment. That means if its cold outside, which is an external environment, your sensory neurons pick that up shoot it through your PNS (peripheral nervous system) into your CNS where the brain sends the electric signal back down your CNS and into your arrector pili muscle where it contracts causing your hair to once stand up and give you, what we call "goose-bumps". OK bye now!
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