Human activities need to consume energy, just as the rotation of an electric fan needs to consume electric energy. The energy produced by human body is mainly converted from food. Rice, fish, vegetables and so on. When eating, it is digested and broken down into various nutrients in the stomach. Energy is produced by the constant chemical reaction of nutrients in human body. These chemical reactions must rely on the help of various enzymes in the human body that are very sensitive to temperature. The optimum temperature for enzyme gel activity is 37 degrees Celsius. When the body temperature drops, the activity of enzymes will be weakened, the chemical reaction in the human body will be slowed down, and the energy generated by the human body will also be reduced. When the body temperature is below 30 degrees Celsius, brain activity will be affected; Below 22 degrees Celsius, the heart will stop beating. Even if the body temperature is very high, the child will have convulsions as high as 4 1 degree Celsius. Above 43 degrees Celsius, people will die.
Normal body temperature is controlled and regulated by the brain. Usually, the brain maintains normal body temperature through the heating system in the human body, such as muscles, liver, heart and brain, and the cooling system in the human body, such as sweat glands and skin.