Why does the skin get goose bumps?
This is everyone's experience. When the weather is cold and your clothes are not warm enough, you will not only feel cold, but also tremble all over. And there will be a layer of goose bumps on the skin. This is because human skin can not only protect our internal organs and excrete sweat, but also regulate and maintain body temperature. When the skin is stimulated by cold, the sensory cells under the skin will immediately notify the brain, which will make people feel cold, and at the same time, it will also make the vertical hair muscles under the hair contract and make the hair stand up. At this time, the skin surface becomes very tight, forming a protective wall to prevent heat loss in the body. When the vertical hair muscle contracts, it will pull the hair roots, so the hair will stand upright. If you want to straighten your hair, you will bring a piece of skin, so you will form a small pimple, which looks like hairless chicken skin, so it is called goose bumps. Goose bumps are a manifestation of skin's self-defense function. It reminds people to "keep warm and beware of catching cold". At this time, you should take warm measures immediately to avoid catching a cold.
People not only get goose bumps when they are cold, but also get goose bumps when they hear harsh sounds and see disgusting and horrible things.
Chicken nuggets have obvious self-protection function for animals covered with hair. These animals will stand up when they are cold, which makes their fur fluffy, thus keeping them warm from the cold. Australopithecus, the ancestor of mankind, was also covered with hair. In the process of evolution, human hair gradually degenerated, but the physiological function of goose bumps to keep out the cold remained.