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为什么冷的时候会起鸡皮疙瘩,害怕的时候也会起鸡皮疙瘩?这是因为皮肤上的毛囊下面有纤小的平滑肌,叫立毛肌,它收缩的时候将毛囊拱出皮肤,使毛发直立起来。在寒冷或恐惧的时候,交感神经系统启动,肾上腺素水平升高,这些小肌肉就服从命令,开始工作。
Why do you get goose bumps when you’re cold and goose bumps when you’re scared? This is because there are tiny smooth muscles under the hair follicles on the skin, called piloerection muscles, which arch the hair follicles out of the skin when they contract and allow the hair to stand upright. When cold or fear, the sympathetic nervous system starts, the level of adrenaline rises, these small muscles obey orders and get to work.