People's body temperature can reach 38 degrees, why can't they stand the temperature of 38 degrees?
The human body has a temperature regulation system to ensure the constant temperature of the human body. The premise is that heat generation and heat dissipation are similar. If heat production cannot dissipate heat, the human body will generate heat, and if heat production cannot keep up with heat dissipation, it will freeze. The heat dissipation of human body mainly depends on convection, radiation and contact. Convection means that hot air flows on the body surface and exchanges with the surrounding air to take away some heat; Radiation is when the temperature of the human body is higher than the outside.
Contact means that when the temperature of human body is higher than some objects, there will be heat exchange in direct contact. Therefore, there is an important factor affecting human heat dissipation, that is, temperature difference. The temperature of human body is higher than the ambient temperature, which is beneficial to the heat dissipation of human body. As we all know, cheetahs are good at sprinting, but if they run for a long time and generate too much heat, they will damage their bodies.
When the outside temperature is 38℃, it is unfavorable to the heat dissipation of human body. At this time, the body's thermoregulatory center will play a role. Expanding peripheral blood vessels means increasing blood flow and perspiration, correspondingly reducing the blood supply of exercise organs and psychological activities that want to exercise, so that the human body can balance heat production and heat dissipation from two aspects, and ensure human function.
Off-topic, talk about some precautions for heatstroke prevention in summer. In some high humidity and high temperature environments, you should pay close attention to your physical condition. If you feel uncomfortable, you should quit quickly. In that environment, it is easy to cause heatstroke, the temperature regulation is out of control, and the cure rate is only about half. This is a very dangerous emergency.
The outside temperature is higher than the human body, which is not conducive to human heat dissipation and will affect human function. Internal organs are in the body, isolated from the outside world, and the heat generated is even less conducive to heat dissipation. So sometimes the temperature is too high and the internal organs are uncomfortable.