Why do people tremble when they feel cold? Why goose bumps? Here is the information I collected. Let's have a look! 1、 Why do people tremble when they feel cold?
This is what we usually call shivering. In order to resist the cold climate and maintain normal body temperature, the body will generate a lot of heat through shivering So as to ensure the normal physiological function of the body
Shivering is a function of the human body's internal environmental control system. Behind the eyes is a tiny brain tissue responsible for controlling body temperature, called the hypothalamus. Shivering is a way for the hypothalamus to keep the body at a constant temperature. Shivering can release energy when the body is cold (on the contrary, shivering can make people sweat when the body is hot).
When a person has a fever, signals from the hypothalamus will further heat the body, trying to kill harmful bacteria. Here's how the process works: the body contracts the subcutaneous blood vessels close to the skin, while other blood vessels relax, allowing blood to flow to the infected site. The blood is therefore away from the outer surface skin, so you will feel cold. In order to replenish heat, the thyroid gland will begin to contract muscles, resulting in shivering.
If people are frightened, they may also tremble. For example, when you go home after watching a night movie, you will be frightened when someone suddenly comes out of a. Your brain will release adrenaline into your body, preparing you for a fight or fleeing the scene. Either way, your body is in a state of high tension. When the body is in a state of panic, it behaves much like when the body is cold. Your blood flows away from the surface of your skin, which will make you tremble. In an emergency, there is another obvious advantage of blood flowing from the surface of the skin, which is that even if you are injured, you won't shed too much blood. 2、 Why can the person feel cold when meeting rise gooseflesh?
When people encounter cold weather, it will look like "goose bumps" on our skin. How do goose bumps come into being?
Originally, a small bundle of tissue called vertical hair muscle is connected under the hair of human skin, which controls the movement of hair. When cold air invades the surface of human skin, the temperature sensing nerve on the surface of skin immediately transmits the message to the brain. The brain, like a commander, issues orders to shrink sweat pores on the skin. So the vertical hair muscle under the hair began to contract, and the hair stood up one by one. The contracted vertical hair muscle looks like a small pimple, which can effectively prevent the loss of heat in the body. It is a self-defense response of human body to cold resistance. At this time, you should consider adding clothes.
People not only get goose bumps when they are cold, but also get goose bumps when they hear harsh sounds and see disgusting and frightening things. So, do you understand?