Why is the body temperature not constant in amphibians???

Animals whose body temperature changes with the change of outside temperature are called ectotherms.

Such as fish, frogs, snakes, etc. Ectotherms are also known as cold-blooded animals, and most of the animals on Earth are ectotherms. Ectotherms do not need to be cold, but rather have a body temperature similar to the environment in which they live, such as earthworms.

The body temperature is equal to the temperature of the soil in which it lives; The body temperature of the fish is equal to the temperature of the water around it. The body temperature of this group of animals changes with the change of environmental temperature, so the proper noun of ectothermic animals to describe their variable body temperature is the best way to describe its true meaning.

All animals, except birds and mammals.

Outside, they are ectotherms, and their body temperature changes with the environment. This does not mean that they must not be able to control their body temperature, but they can change their body temperature by seeking a cool or warm environment, but they cannot directly control their body temperature, i.e., they lack the physiological function to maintain a certain body temperature.

The body temperature of amphibians changes with the change in the outside temperature. They are free to seek out a cool or warm environment to change their body temperature, but cannot directly control their body temperature, that is, they lack the physiological function to maintain a certain body temperature.

The heart is not like mammals and birds that separate arterial and venous blood, so arterial and venous blood is mixed together, and it cannot provide enough oxygen to the cells to make heat, in short, the circulatory system is not advanced.

It takes a certain amount of energy to maintain body temperature, and in the process of evolution, in order to conserve energy, there is no physiological function to control body temperature.

They are lower animals that have evolved to adapt to their environment and live until now.

The body temperature is constantly fixed (1, whale 3, bat 4, white caikong Chang finned dolphin 5, white crane 9, magpie).

Those that are not vertebrates are: silver deficit (2, snail 10, yellow worm).

When amphibians feel cold, their movements slow down, so they must maintain their body temperature and thus stay active. Unlike homeotherms, amphibians must be warmed from the outside when they feel cold. For example, they will sit in the sun to keep warm, and once they are warm, they will return to the shade to stabilize their body temperature.

When the amphibian manages to keep warm, the wet ** on its body can cause trouble for itself. The water in the upper mucus turns into water vapor, which consumes a lot of heat in the process, so that the amphibian's body temperature cools down. This also means that it loses a lot of moisture and is therefore in danger of drying out.

This is one of the reasons why amphibians live in humid areas. However, some frogs living in dry areas can hide more than a meter deep underground for up to six months until the rainy season arrives, forming a thin shell that helps prevent water from evaporating from their bodies.

In some countries, amphibians do not get enough heat to stay active during the cold winter months. In such cases, the amphibians will look for a place, such as sheltering from the low temperature at the bottom of a pond full of mud. At this time, it enters a state of sleeping, called hibernation.

During hibernation, the heart beats slowly and the body temperature is low. Amphibians also stop breathing with their lungs and get all their oxygen through **, and several species of frogs living in North America do survive in very cold conditions. Most of the water in the frog's body turns into ice, but it is still alive.

With the exception of birds, the body temperature of mammals is not constant.

Bats, goldfish, sharks are all ...

If you're an eighth-grader, there should be two questions like this:

1. How do mammals such as rabbits keep their body temperature constant?

The constant body temperature of rabbits (including mammals) is not only insulated by the fur on the body surface, but also by the coordinated role of the developed nervous system, circulatory system, and respiratory system. The respiratory system strengthens the gas exchange capacity; A well-developed circulatory system can increase the ability of the blood to carry oxygen; The regulation of nerves and body fluids can strengthen or weaken the metabolism of rabbits (mammals) and regulate the process of heat dissipation.

2. The significance of constant body temperature to the adaptation of animals to the terrestrial environment:

Constant body temperature is achieved by homeothermic animals through their own corresponding structural and physiological regulation. The terrestrial environment is changeable, and the temperature difference varies greatly, and the temperature affects the distribution, physiology and reproduction of animals. Enzymes that catalyze a variety of chemical reactions in animals are also affected by temperature changes.

Constant body temperature is conducive to the normal progress of metabolism, and is conducive to the regional distribution, survival and reproduction of animals.

Hope it works.

The activities of animals are inseparable from the chemical reactions in the body, but the reaction rate and reaction rate of organic substances are usually extremely low, and they simply cannot provide the substances and energy that animals need on time.

But animals survive because of enzymes. Enzymes are organocatalysts that greatly increase the reaction rate and reaction rate. However, enzymes have their specific survival conditions, and they must survive at a certain temperature, a certain pH value, and a certain solution concentration to exert maximum effectiveness.

Otherwise, it will reduce activity or decomposition. Without enzymes, all chemical reactions are slowed down and stopped. Animals can't survive.

Therefore, changing the temperature changes the activity of the enzyme, which directly leads to the chemical reaction in the animal.

In fact, there are many animals in the ocean that have a constant body temperature.

The constant body temperature ensures the normal activity of various enzymes in the body, which is also an important point to ensure the metabolism of animals.

A constant body temperature allows the animal to move quickly (unlike cold-blooded animals), which plays an important role in the survival of land animals.

The body temperature of homeothermic animals is basically constant, and normal life activities can be carried out in all seasons of the year, which is not affected by the seasons (cold-blooded snakes, frogs and other animals need to hibernate), and for land life (unknown land exploration), the time is undoubtedly more sufficient, and for special terrain and climate, the adaptability is undoubtedly much stronger (at least the low temperature zone cannot limit the exploration of homeothermic animals).

Cold-blooded animals are more susceptible to temperature than homeothermic animals, which is not conducive to adaptation to the environment. When the temperature is low, it will slowly lose its mobility and consciousness, which requires cold-blooded animals to seize the appropriate temperature for a period of time to complete the breeding task, otherwise it is the demise of the family and even the population, relatively speaking, homeothermic animals have to deal with this problem much more calmly.

For example, if it snows heavily outside, ectotherms will hide in their holes and not come out, because it is too cold and their function will be reduced.

Thermostatic animals can come out to move, and fur gods can protect themselves from frostbite.

Ability to improve adaptability to the environment.