Why does the normal human body feel hot when the temperature is 37 but above 30?

The average normal body temperature of the human body is 36-37, and theoretically the ambient temperature will only feel hot when it is higher than the body temperature. But in the summer, I believe everyone has the same experience, when the outside temperature exceeds 30, it feels hot, obviously 6-7 lower than the body temperature, why do you feel hot? <>

Although the human body temperature is maintained at 37, this temperature refers to the internal temperature of the human body, not the temperature of the ** surface. In addition to people feeling heat in the environment of 37, pet dogs and pet cats around us will also feel heat at this temperature, because most mammals are homeothermic animals, and the body temperature is about 37 degrees. <>

The normal temperature of the human body is around 37, which does not mean that people are most comfortable when they maintain a temperature of 37 in clothes or in a house. Because the heat produced by the body's metabolism must be dissipated outward at a certain rate. If the ambient temperature is too high, these heat cannot be dissipated and accumulate in the body, which will make people feel very uncomfortable.

At this time, the human body has to excrete a large amount of sweat, and evaporation is used to dissipate heat to reduce body temperature. Only when the temperature is lower than the body temperature can the heat of the human body be dissipated freely. However, when the temperature is too low, the heat dissipates too quickly, exceeding the normal heat dissipation speed of the human body, and the human body will feel cold again.

According to domestic and foreign experiments, the most comfortable temperature is 19-24 in summer and 17-22 in winter. People feel hot when the ambient temperature exceeds the upper limit of the comfortable temperature; If it is over 37, it will feel very hot; The upper limit of the average person can tolerate the temperature is 52.

Conversely, people feel cold when the ambient temperature is below the lower limit of the comfortable temperature; If it is below 0, it will feel cold. The lower limit of temperature that can be tolerated by people who are generally engaged in outdoor activities and dressed appropriately is about minus 34.

This 37 °C refers to the temperature inside the human body, not the temperature of the body surface, most of the energy ingested by the human body is used to produce heat, when the ambient temperature exceeds 30 °C, it is difficult for us to passively dissipate heat, we can only dissipate heat through sweat, at this time we will feel very uncomfortable.

Because the body's metabolism will produce heat, it must continue to diverge outward, when the ambient temperature is too high, these heat can not be dispersed normally, it will accumulate in the body, and people will feel very uncomfortable.

At the age of 37, Celsius is the normal body temperature of the human body, and in summer, people feel the most comfortable temperature is 19-24, and in winter it is 17-22. It is the temperature of the human body's external sense.

Now the normal body temperature of the human body has long been generally lower than 37 degrees, generally up and down.

Under normal circumstances, it refers to the condition that the humidity is suitable (such as 50%) and does not expose to direct sunlight. At around 30 degrees Celsius, the human body feels the best, and even when sleeping, it rarely catches a cold. Above 33 degrees Celsius, the body begins to feel hot, and sweat glands begin to activate and secrete sweat for evaporation and cooling.

The metabolism of a living person is constantly melting and must effectively dissipate heat. The temperature of 35 degrees Celsius is lower than 37 degrees Celsius, and the force is too small, and the heat dissipation effect of the body is relatively poor. "The human body temperature is 37 degrees Celsius" is a vague generalization.

Normally, the temperature under the armpits is about 36 to 37 degrees Celsius, the temperature at the base of the tongue is about 363 to 37 degrees Celsius, the temperature in the colon is about 377 degrees Celsius, and the body surface temperature outside the armpits is generally less than 37 degrees Celsius. A person's body temperature will fluctuate under the influence of temperature, environmental humidity, different moments of the day, physical fitness exercises, physical condition, etc.

The heat caused by the internal metabolism of the human body flows into the lower temperature ** surface along the temperature gradient direction, and disperses into the lower temperature natural environment to avoid overheating. When the natural ambient temperature rises above 30 degrees Celsius, the temperature gradient direction is relatively small, the heat dissipation rate decreases, the critical temperature rises, and the warning of "feeling very hot" is sent out from the lower brain. The body sweat can bring heat through the evaporation of water, and its effect is harmed by the temperature of the gas, when the air humidity is 100%, the temperature of 35 degrees Celsius is dangerous, which can cause the key temperature of the body to be too high and medium, and it may be fatal within a few hours.

At 100% humidity, a temperature of 32 degrees Celsius can be very uncomfortable.

Because our suitable outside temperature is above 25 degrees. The fact that we experience "heat" does not mean that heat exchange is endothermic or exothermic, but rather that environmental factors are compared to our optimal survival temperature. Our body is always losing heat, even in a temperature of 40 degrees, we are also open to the outside world according to the respiration of plants that sweat a lot, because all our actions are mechanical energy is converted into mechanical energy, and the unnecessary heat generated in the process cannot be accumulated in the body.

On the other hand, the higher the temperature, the more difficult this kind of heat dissipation will be, and it is necessary to use accelerated inhalation and sweat gland secretion to indirectly increase the drinking water requirements.

In addition, if you deviate from the appropriate body surface temperature, the central nervous system, circulation, digestive tract, and respiratory tract will occur. In biochemical reactions, the effect of temperature is gradual and continuously linear. and the type of 0-1 bouncing wave pattern reflected in the electrical equipment.

For example, because the body surface temperature is close to the body temperature of the human body, it cannot be very good for heat dissipation, so everyone will increase a lot of sweating and urination to help the body dissipate heat, which causes the blood concentration value to increase, which is actually dedrying. The increase in blood concentration will cause problems in the delivery of electrolyte solutions in the central nervous system, resulting in dizziness, nausea and vomiting, heart disease and a series of other problems. This is essentially because our body is a very scientific and reasonable high-precision system software, and water in the body is not only for heat dissipation, but also for a series of other uses.

At this time, their body will send a warning message, which is actually to tell you that you are hot, and you should drink more water and seek shelter in a shady area.

This is because our breathing exchange is about 30 degrees, and if it is 35 degrees, there is a possibility that someone will breathe tightly, and in order to maintain your physical health, the problem will be solved by heating up the body.

This is because the surface temperature is much higher than 35 degrees, and then everyone is in contact with the ground all the time, and the hot temperature of the ground will rise.

The body temperature is 37 degrees, and the body will always be in a state of heat dissipation, and the outside environment is 35 degrees, so it will not be able to dissipate heat well, so it will feel very hot.