If a healthy person is naked in a windless environment of 25 degrees, his body temperature is 36.5 degrees, his forehead is 36.4 degrees, his back is 33.2 degrees, his hips are 30.3 degrees, his knees are 27.7 degrees, his back is 3 1. 1 degree, and his instep is 27.2 degrees. It can be seen that the temperature of the forehead is the closest to the body temperature, so it is no wonder that people often touch their foreheads to judge whether they have a fever.
Normal body temperature is the best temperature for human life activities. Generally speaking, the upper limit of body temperature is 44 to 45 degrees. At this time, protein in the body will be denatured, and the functions of liver, kidney and brain will be abnormal. If the temperature rises again, people will die. The lower limit is 33 degrees, at this time you will be unconscious and lose consciousness; When the temperature drops below 33 degrees, the thermoregulation function is lost; When it drops to 28 degrees, the myocardial contraction will be out of sync, and the pumped blood will drop significantly, leading to death.
It can be seen that in order to carry out normal life activities, the body temperature should be kept between the upper and lower limits. Then, why should people's body temperature be kept at around 36 degrees, closer to the lower limit than the upper limit? The scientific community has not yet formed a unified understanding of this issue. Australian scientist Paul put forward his own views on this. He thinks the proportion of water is the smallest at 35 degrees. When the body temperature is about 36 degrees, it is most suitable for the survival of various enzymes in the human body, and neither too high nor too low. Enzymes widely exist in various organs of human body and participate in various biochemical reactions to ensure people's needs in all aspects. For all warm-blooded animals, 36 degrees is the best temperature to ensure the survival of enzymes. In addition, when the body temperature is 36 degrees, the heat generated and discharged is the least, which is very beneficial to keep the body temperature constant. Maintaining the body temperature has less calorific value, which is also beneficial to human evolution. Compared with other explanations, the above statement is more convincing, but it is still inconclusive whether it is accurate and complete.
Measuring body temperature