Whenever we encounter cold and fright or are very excited, the body will always tremble, and a layer of goose bumps will also form on the surface of the skin.
So why do people get goose bumps?
Because whenever we encounter a stimulus, our sympathetic nerve receives a signal, adrenaline is secreted immediately, and the current is transmitted to every cell in the body. When the hair follicles on the surface of our skin receive information, the slender smooth muscles underneath the hair follicles, also called erectile muscles, contract immediately, and the muscle cells become elastin fibers, arching the hair follicles out of the skin surface, forming small bumps, and sweat hair is also affected. From lodging to upright. Finally it became our goose bumps.