A Complete Collection of 100000 Whys
Fav十万个为什么
为什么冷天会起鸡皮疙瘩？
简单的摘要：冷天起鸡皮疙瘩的原因主要是皮肤受到寒冷刺激、立毛肌收缩以及体温调节反应。
1、当皮肤受到寒冷刺激时，冷觉感受器会向大脑发送信号，引发一系列生理反应。
2、大脑接收到冷觉信号后，会通过自主神经系统指挥立毛肌收缩，使毛囊周围的皮肤突起，形成鸡皮疙瘩。
3、这种立毛肌收缩的反应是体温调节的一种机制，有助于减少体表面积，减少热量散失，以维持体温稳定。
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