Human body is 37 degrees. Why can't people stand it when the temperature reaches 36 degrees?

A person's body temperature is not the body surface temperature. A person's body surface temperature is only about 15 degrees, and there are differences in different parts. When the ambient temperature reaches 37 degrees, you will naturally feel the obvious temperature difference.

When the temperature reaches 37 degrees, it is difficult for the human body to dissipate heat, and people will feel very hot. Under normal circumstances, the human body temperature is kept between 36.5℃ and 37℃, while the outside temperature is usually higher or lower than this temperature. The reason why the human body can keep constant temperature all the time is because it has a constant temperature mechanism, which can adjust or exchange body temperature with the outside world. There are several ways. One is conduction, which requires some medium, such as air, water and metal. However, air is not the main heat dissipation method because of its poor thermal conductivity. The second is thermal radiation, which mainly dissipates heat directly through the skin. When the body temperature is higher than the outside temperature, it can play a better role. The third is evaporation, including sweating and breathing. Of course, defecation will also release some calories.

But in hot weather, only evaporation can play a better role, so we often sweat a lot, and heat is achieved by sweating a lot. At the same time, human muscles will be in a relaxed state, reducing heat accumulation, so as to keep the body temperature within the normal range.

These physiological reactions are actually controlled by the so-called "body temperature center" of the hypothalamus, which controls how the body adjusts its body temperature with the change of external temperature through the nerves of the whole body. When it exceeds the limit that the human body can adjust, people will suffer from heatstroke or hypothermia, organ function will decline, and even die.

However, as far as high temperature resistance is concerned, experiments have been carried out. In quite dry air, healthy people can stay at 50℃ for two hours, at 70℃ for 15 minutes, and at 100℃ for 1 minute without any damage. However, if you stay in the humid air at 45℃ for 1 hour, you will suffer from heatstroke and coma. Therefore, it can be determined that the high temperature resistance limit of human body is affected by humidity. At a certain temperature, the lower the relative humidity in the air, the faster the water evaporates, and vice versa. When the temperature and humidity reach a certain limit, the human body's heat cannot be emitted, and the body temperature will rise, exceeding the tolerance limit of the human body, leading to death.