Why do animals molt, what animals shed their skin, and which animals shed their shells

01 The epidermis of the animal is the keratinization product of **, there are no living cells, it cannot grow with the growth of the animal individual, when the animal grows to a certain extent, the lifeless epidermal scale is limited to the development and growth of the individual, at this time, only the original epidermal scales can be adapted to the new epidermal scales to adapt to its growing body.

Because insects do not have the skeletal system of higher animals, they rely on the outer body shell to play the role of ** and bones. This body shell is also known as an exoskeleton or body wall. Although the body wall ensures that the insect is more advantageously adapted to various natural environments, it occurs in different parts of the insect's body, and some thick and hard places occur.

Ossified, inelastic, when the larva grows to a certain stage, the growth of the worm body is restricted, it has to shed the old skin, replace it with a new skin to continue to grow. Insect shedding is an indispensable part of their lives. Each time the larvae shed their skin, their bodies were enlarged, their internal organs were further developed, and at the same time, their external morphology was also changed.

In addition, since the skin of insects is formed from the products of metabolism, peeling also has an excretory effect. The growth and morphological changes of insect larvae show a certain regularity due to the shedding of the skin, for example, the pink butterfly that damages vegetables sheds its skin 4 times.

The process by which insects change their coats is controlled by the endocrine organs in the body. When the insect grows to a certain extent, it secretes a skin hormone that separates the old epidermis and dermal cells of the insect, and gradually forms a thin new epidermis, and finally, the insect contracts the abdominal muscles to increase the blood pressure in the chest, so that the back arches upward, so that the old epidermis comes out along the particularly fragile part of the back of the chest. For example, when the cicada sheds its skin, it splits from the ** "T" shape on its back, wriggles from the outer skin, first heads and then tails, and slowly crawls out.

Insects that live in water, with the help of which they absorb air or water, make their bodies swell, and they also crack in the particularly fragile places of the old epidermis, and later come out of the soft insect body by the force of wriggling.

An exoskeleton secreted by insect epidermal cells.

Once hardened, the edges can not continue to expand while making arthropods.

The growth of tissues and organs in the body is restricted. Therefore, arthropods have molting during growth and development. During molting, an enzyme is produced that ruptures the exoskeleton, from which arthropod larvae can emerge and epidermal cells resecrete a new exoskeleton.

The body can grow in size until the new exoskeleton is not completely hardened. Therefore, arthropod larvae that are developing and growing rapidly have more molts. When it grows to the point where it no longer grows, the molting stops.

Not all reptiles.

All molt, such as turtles. And many arthropods due to exoskeleton problems, too"Molting"。

Snakes are a very common molting animal. Why do snakes shed their skin? Snakes are covered with scales all over their bodies, but these scales are different from those of fish. The scales of the snake are made up of the outermost cuticle.

becomes, so it's called scales. It is relatively tough and impervious to water, and it does not grow as the body grows. When the snake grows older, it needs to molt its skin once, and the new scales are larger than the original.

Snake scales not only prevent water evaporation and mechanical damage, but are also the main tools for snake crawling. Snakes generally shed their skin every two or three months. Snake molt.

When barking, choose rough ground or twist your body around a branch, rub off your old "coat" and put on a "new outfit". Therefore, snakes can often be seen at the mouth of stone caves or on tree branches.

1. Snakes, knows, crabs, shrimps, praying mantises, locusts.

tortoises, and a series of arthropods.

The main factors affecting the molting of arthropods are environmental temperature, salt concentration, dissolved oxygen, light, pH value, living space, intrinsic rhythm, nutrition and environmental exogenous hormones.

2. Know: Cicadas live in temperate to tropical regions of the world (about 2,000 species of cicadas have been recorded). Some species found in desert areas will expel excess water from the tergum when the body temperature is too hot, which will cool and dissipate heat.

3. Crab: Crab (pángxiè) belongs to the class of molluscs, decapods, and is a crustacean whose body is protected by a hard shell and breathes by gills. Taxonomicly, it is related to shrimp, lobster, hermit crab.

It is a similar animal. The vast majority of species of crabs live in the sea or near the sea, but some inhabit freshwater or land. Common crabs are pike crabs.

Offshore pike crab, blue crab and Chinese mitten crab (river crab, hairy crab, clear water crab), etc.

4. Shrimp: shrimp (shrimp) is a kind of arthropod living in the water, belonging to arthropod crustaceans, there are many species, including Antarctic red shrimp, green shrimp, river shrimp, grass shrimp, prawns, prawns, lobsters, etc. Shrimp has a high therapeutic nutritional value, can be steamed, fried and other practices, and can be used as Chinese herbal medicine.

5. Praying mantis: The scientific name is praying mantis, also known as knife mantis, invertebrate, carnivorous insect. In ancient Greece.

People regard the praying mantis as a prophet, and it is also called a prayer insect because the front arms of the praying mantis look like a praying girl. In addition to the polar regions, it is widely distributed all over the world, especially in the tropics. There are about 2,000 species known in the world.

About 147 species are known to China. Including the Chinese giant mantis, the narrow-winged mantis, the broad axe mantis, the brown mantis, the thin-winged mantis, the green mantis, etc., the praying mantis is an important natural enemy of agricultural pests.

6. Locusts: Locusts, commonly known as "grasshoppers", belong to the order Orthoptera, including the species of grasshoppers (Tetrigoidea), Eumastacoidea, and Locustoidea, there are more than 10,000 species in the world, and more than 1,000 species in China, distributed in tropical and temperate grasslands and desert areas all over the world. Locusts mainly include flying locusts and earth locusts.

Molting animals are: spiders, centipedes, cicadas, tardigrades, tardigrades, and more. Molting animals include the following phyla:

Arthropods, clawed animals, tardigrades, snouts, gill drags, armoured animals, nematodes, and nematodes, and other phyla, such as the phylum Pellets, were thought to be a possible part of this, but are often delineated because they lack the main features of molting.

The members of the molting animals that do not belong to the panarthropod were once called annular neurozoans, but are generally considered to be paraphyletic. Moltings are a large group of protostomates, including the phylum Arthropods, the phylum Nematodes, and several small phyla, originally defined by Auinaldo et al. in 1997, mainly based on the 18S ribosomal RNA tree. This classification is also supported by a range of morphological evidence, as it includes all animals that shed their exoskeletons.

The definition of molt was also morphologically based on morphology by Perrier in 1897 and Seurat in 1920.

People are always curious about things that are rare in their daily lives, especially children. It's like a snake shedding its skin. It's a simple, natural thing, it's just that an animal comes out of ** once or twice a month, and the process of molting always stimulates people's imagination.

While the word "molting" is often used to describe the process, it is not accurate. Snakes don't actually shed their skin. They just shed a layer.

Well, the epidermis. When a snake molts, it still retains it (obviously) and its ** usually becomes brighter after molting.

What is "peeling"? What is "molting"? The following uses "molting" to explain all the above "molting", but in essence, there is no difference in the meaning of the two, but the scientific terminology of molting has stopped.

In addition to snakes, many other animals in nature also molt, including various insects, arthropods, and lizards. This process is also commonly referred to as shedding or molting. However, "molting" is more commonly used in snakes.

The process of molting a snake is that the skin of the snake is always covered with scales, but these scales are completely different from those of fish.

The scales of snakes evolved from the epidermis of the outermost layer of snake skin. It is called cuticle scales, which are waterproof and tough. The scale texture of the snake can be smooth bones or rough particles, but it cannot grow with the snake's body, when the snake's body grows more than the current ** size, it is not the original packaging of their body, all it has to do is shed the original epidermis and then grow a new **.

Molting has many benefits for snakes. First, the outermost damaged ** is replaced, and a new ** grows to better protect the body. Secondly, many altered organisms (e.g. insects) have parasites on their epidermis, and removing them can protect them from parasites (e.g. maggots).

In the molting process of many organisms, it has been proven that molting is a means by which many organisms later become larger.

Do snakes stop molting? Snake molting, is repeated every once in a while, its life frequency is definitely a change, the frequency of molting also depends on the temperature, feeding frequency and single eating and activity, etc., most snakes molt 4 to 8 times a year, as long as the growth continues like this, it is said that the snake's skin will always fall off. Before it was time to molt, the snake stopped eating and found a safe place to hide.

This is because their skin is all inactive keratin, and after a long time, they will no longer be able to adapt to the new body, so they need to be removed.

The epidermis of the animal is the keratinization product of **, there are no living cells, can not grow with the growth of the animal individual, when the animal grows to a certain extent, the lifeless epidermal scales are limited to the development and growth of the individual, at this time only the original epidermal scales can be used to adapt the new epidermal scales to its growing body.