天气寒冷时,我们的皮肤上会出现一些密密麻麻的小疙瘩,看起来像去了毛的鸡皮一样,因此人们叫它“鸡皮疙瘩”。鸡皮疙瘩是怎么产生的呢?当冷空气侵袭皮肤表面时,皮肤表面的温度感受器立刻把消息传给大脑。大脑就像司令员一样发布命令,收缩皮肤上的汗毛孔。汗毛下的竖毛肌也开始收缩,汗毛就一根根竖了起来。收缩的竖毛肌看上去就像一个个小疙瘩,它们可以阻止体内热量的散失,是人体抗寒的一种自卫性反应。 When the weather is cold, there are some tiny lumps on our skin that look like the chicken skin, so people call it “goose bumps.” How is a goose bump produced? When cold air invades the surface of the skin, the temperature sensor on the skin immediately sends the message to the brain. The brain, like the commander, issued an order to shrink the sweat pores on the skin. Hair shaft under the hairs also began to shrink, hairs on a root erected. Shrinking hair shaft muscles look like a small lump, they can prevent the loss of heat in the body, is a self-defensive response to cold.