Why is the human body temperature 37 and not 38? What exactly is the difference between humans and h

Humans are actually homeothermic animals, but if the human body temperature reaches 38 degrees, fever symptoms will appear, and the ability of homeothermic animals to adapt to the environment is higher than that of ectothermic animals.

Because if it is 38 degrees, human beings may not survive, this is the choice of the law of nature. There is not much difference between humans and animals, both belong to the creatures of the earth.

Because 37 degrees is the most suitable temperature for most enzymes in the human body, the human body temperature is 37 degrees, and there is not much difference between humans and homeothermic animals.

It's not the same. For example: pigs; Cattle; Sheep; Chicken 40-42Some.

Reptiles. The body temperature of cold-blooded animals varies with the outside air temperature.

Humans are homeothermic animals. The body temperature of the human body is generally maintained at about 37 degrees, and humans are mammals.

The higher animals can rely on the regulatory mechanism in the body to regulate their body temperature, so that the body remains in a stable state, and ectothermic animals.

It changes with the temperature of the outside world, and does not have its own temperature regulation system.

Ectotherms (warm-bloodeds) refer to animals that regulate their own body temperature and are not as dependent on outside temperature as cold-blooded zoomeds (ectotherms).

How animal isothermia is achieved1. Birds. Birds are cloaked in ears and have feathers. The heat insulation effect of fluff is very good, so there are fluff clothing, mattresses and sleeping bag products in human society.

Feathers are also found in some dinosaurs. Therefore, it is speculated that dinosaurs were also homeothermic.

2. Terrestrial animals.

Terrestrial animals do this by sequestering a layer of air in their feathers or hair. Terrestrial mammals.

Humans are homeotherms, so they are not ectotherms. This is the result of evolution, and in general, it is just a matter of accepting it. Homeotherms and ectotherms separated very early in the evolutionary history of vertebrates and evolved in different directions.

The difference between constant temperature and variable temperature lies in the presence or absence of a thermoregulatory center, and in the way the body produces heat. Animal heat production is by digestion and absorption of organic matter and then oxidation for energy, and homeothermic animals have a thermoregulation center, with a stable set point, humans are about 37, birds are about 40, different body temperatures adapt to the most suitable response needs of different biological enzymes, while ectothermic animals do not have this regulatory center, their body temperature regulation is by looking for the heat source that exists in nature, so as not to lose too much body temperature to weaken the activity of cellular enzymes, so that the activities of individual animals are weakened, and it is easy to eat.

Relatively speaking, homeothermic animals adapt to a wider range of environments, can go to cold places, but stay for a while, and slowly recover from the environment before the temperature regulation disorder, while ectotherms generally adapt to warmer places, and need to hibernate when they reach cold places, even if the relative air environment temperature in the Arctic sea water is higher, but there is only one slap that can count the snake species, and there are too many snakes in tropical areas such as Africa, and the size is much larger.

Both homeotherms and ectotherms are vertebrates and are two different branches of vertebrates because of the influence of the environment. As far as land organisms are concerned, although ectotherms are more difficult to adapt to cold places, but because the body can not regulate the temperature independently, there is a lot less energy consumption, so ectotherms can eat for a long time, and the degree of digestion of food is relatively high, snakes, crocodiles, lizards and other animals, is relatively less, such animals live in places that are generally relatively lacking in animal resources, and it is not easy to catch and eat, so the body temperature that is hungry does not need to be constant to be naturally selected.

Thermostatic animals need to maintain body temperature by burning fat, sugar, etc., and the body's calorie consumption is very fast, so the consumption of energy is fast, and it is necessary to maintain a high predation frequency, so homeothermic animals generally live in places with relatively rich biological resources. The ocean is a little special, and most of the fish are ectotherms, but the temperature of the sea water is generally stable, and the body temperature of the fish can be maintained, but the fish also have migratory behaviors, predatory and reproduction for warmth.

Ectotherms and ectotherms are also only two general classifications of species, which are classified according to similar characteristics in the function of organisms, ectotherms are mainly reptiles and fish, while homeotherms are mainly mammals. There are some ancient animals in the ocean, and there is a third way of thermoregulation, which has the characteristics of thermostatism and constant temperature, and the body temperature can be adjusted within a certain range, but it is relatively high compared to the seawater, and the muscle temperature of some sharks can even reach 26, and the temperature of the sea water is so high, especially the deeper sea water.

This is the result of natural evolution. The ancestors of human beings were all mammals, and the characteristic of mammals is that there is a thermoregulatory center, and different temperatures adapt to the reactions of different biological enzymes. Ectotherms are more adaptable to changes in their environment than ectotherms.

Because humans are mammals, and mammals are homeotherms, humans are not ectotherms, but homeotherms.

The fact that man is an ectotherm is the result of natural evolution, and there are not so many whys, if it is not an ectothermic animal, then it is not a human being.

What is the difference between ectotherms and homeotherms? Because of this difference, human beings have become masters of the earth.

Is man a living being, the reason is because man has the common material base and structural basis of living organisms, and to judge whether a living body is a living organism, then it is necessary to see whether this living form conforms to the characteristics of living organisms, therefore, human beings are living beings. Here's a section on "Is Human Hall Kai a creature?" Why", interested partners can continue to read and understand.

1. Organisms have these six characteristics, one is that proteins and nucleic acids are the basic components of organisms, but organisms have the role of metabolism, and third, organisms have stress.

2. Fourth, organisms have the phenomenon of growth, development and reproduction, fifth, heredity and variation are the characteristics of organisms, and sixth, for a certain environment, organisms can adapt and affect at the same time.

3. The characteristics of man and living organism are very consistent, so man belongs to living organisms, and for man, it can also be defined from every level of biology, spirit, culture and so on.

4. In biology, human beings are classified as hominoids, and the proximity of chromosome 2 and orangutan chromosome centromere fusion association mode is not less than 16n, which belongs to a higher animal.

Human beings are homeothermic animals, and the body temperature of the human body is usually maintained at about 37 degrees, and they can rely on the adjustment mechanism in the body to regulate their own body temperature, so that their bodies can maintain a stable state.

In fact, it is easy to find that all homeotherms, such as birds and mammals, have a very complex evolutionary characteristic, especially a complex brain. Simpler animals, such as reptiles and amphibians, such as snakes or frogs, are not homeothermic, but so-called "cold-blooded". Comparatively, their brain structure is relatively simple.

So, there is a theory that our bodies have evolved a thermostatic mechanism in order to allow the brain to perform at its best. Because our brain is an extremely delicate instrument, there are all kinds of complex chemical reactions, and there are countless signals that are transmitted and received between nerve cells, and all of these chemical reactions are extremely dependent on temperature. For "precision instruments", the stability of the working environment is the top priority.

Only by keeping the brain in a stable and constant temperature environment can it function stably.

But even if you need a constant temperature, why does it have to be 37 degrees and not something else? This question is also interesting because it is likely to be the result of an evolutionary trade-off. Overall, a high body temperature is more beneficial for life.

Because first of all, high temperature means that the efficiency of various chemical reactions is high, the metabolism is fast, and your movements can be faster and more agile. For creatures, it's definitely better to be flexible than slow.

Secondly, the high temperature environment can kill most of the harmful fungi, preventing health hazards, and at the same time, it can also improve immunity. Actually, when we are sick, we have a "fever", and that's the reason. In the face of invading germs, the body system deliberately raises the temperature in order to fight the bacteria more efficiently.

So where is this balance? Evolution has given us the answer. Because the miraculous thing is that almost all homeothermic animals have chosen 37 degrees in the process of evolution, which shows that this body temperature is likely to be the most optimal choice for homeothermic animals in the earth's environment.

If this statement is true, then temperature can be said to be an important prerequisite for the birth of our human race. You can imagine that in the earliest times, the ancestors of life lived in the sea in a very simple form. The temperature of seawater is quite stable, so there is no need for organisms to evolve the function of maintaining a constant temperature.

But then, some of the animals came out of the sea to the land, and they were faced with a completely different environment. On land, there is a very large temperature difference between day and night and the four seasons, and in this case, if terrestrial organisms want to gain more survival advantages, a constant temperature environment is becoming more and more important.

Fortunately, some animals have evolved the ability to precisely control body temperature by accident, and long-term natural selection has adjusted this body temperature to an optimal 37 degrees. With a stable body temperature, the brains of these animals were able to evolve in a more sophisticated direction and become more and more developed. Since then, these animals have embarked on a path of evolution towards "intelligence", and the group that has gone the farthest is us humans.

From this point of view, stable temperature is likely to be the key to the birth of intelligent life on Earth.