Scientists have found the answer: specific nerve cells that are triggered in the body during times of emotional distress. The sympathetic nervous system — the biological processes that regulate locomotion, ingestion, body temperature and the fight-or-flight response — was previously thought to be nonspecific, meaning that it caused the body to produce the same response no matter what stimulated it. However, a team of researchers has now mapped the nerve cells that carry the sympathetic nervous system's messages around the body, and found that there are at least eight distinct types of nerve cells that activate different responses. One type of nerve makes nipples go hard, another contracts the tiny muscles around hair follicles, making them stand up and produce goose bumps , the researchers said.
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