Earthworms live in dirt, so how do they breathe?

Earthworms rely on secretions to moisten the surface of the body to complete respiration, so it is common to see earthworms crawling to the ground on rainy days, because when it rains, the oxygen in the soil decreases, so they come to the ground in order to breathe.

Because there are many breathing holes on the surface of the earthworm, and the soil is very soft, it can achieve respiration.

Earthworms rely on ** to breathe, have no respiratory organs in the soil, and use ** to exchange with the outside world.

This animal can breathe through the capillaries on its body, which are annelids and do not have a nose.

Earthworms use ** to breathe.

Earthworms breathe by their mucus-secreting body walls, which are always moist. The body walls of earthworms are covered with capillaries. Oxygen in the air dissolves in the mucus on the surface of the body and then seeps into the body walls. Carbon dioxide excreted from the body is also expelled from the body surface through the capillaries in the body wall.

1. Earthworms are suitable for burrowing in the soil with certain temperature and humidity, small temperature difference and rich humus.

2. Earthworms do not have a respiratory system. Breathe by secreting mucus and moist body walls. Earthworms have capillaries in their body walls, and their blood contains hemoglobin, which can carry oxygen.

3. The animal body segmentation can make the body move flexibly, freely and conveniently. The body parts of the earthworm do just that. The ends of the earthworm bristles can be in contact with the rough surface of the surrounding environment, provide support, and coordinate with the annular and longitudinal muscles to complete the movement.

Earthworms do not have specialized respiratory organs and rely on mucus on the surface of the body for gas exchange.

The body surface of the earthworm can secrete mucus, and the oxygen in the atmosphere can be dissolved in this layer of mucus, and the body surface of the earthworm is rich in capillaries, oxygen enters the capillaries and breathes with the various tissues and organs of the earthworm body of the circulatory system**, and the carbon dioxide produced can also be discharged from the mucus on the body surface to the atmosphere. This layer of mucus also acts as a lubricating agent.

Therefore, if the mucus on the surface of the earthworm is dried in the sun, it will suffocate to death, and if the earthworm is placed in the water, it will also die, because the water does not contain much oxygen, but if the oxygen is constantly injected into the water, the earthworm can survive in the water. In addition, after heavy rains in summer, earthworms will crawl out to breathe because the oxygen content of the rain infiltrates the ground is reduced.

Earthworms do not have a respiratory system and rely on mucus-secreting moist body walls for breathing. Earthworms have capillaries on the body wall, and the blood contains hemoglobin, which can carry oxygen.

Earthworms are suitable for burrowing in soils rich in humus with a certain temperature and humidity, little change in temperature difference.

Earthworms do not have a respiratory system and rely on mucus-secreting moist body walls for breathing. Earthworms have capillaries on the body wall, and the blood contains hemoglobin, which can carry oxygen.

The animal body is segmented, which can make the body move flexibly, freely and easily. The body segments of earthworms have the above functions. The ends of the earthworm bristles can be in contact with the rough surface of the surrounding environment to support and coordinate with the ring and longitudinal muscles to complete the movement.

Earthworms rely on ** to breathe, if ** is dry, they can't breathe, which is why earthworms are always wet, and many earthworms will come out on rainy days, in order to have more water and not let ** dry, otherwise it will suffocate.

Earthworms rely on ** to breathe. Earthworms do not have specialized respiratory organs, and normally rely mainly on the moist body surface for gas exchange.

Oxygen dissolves in mucus in the body wall.

It's mucus on the surface of the body, not mucus.

The earthworm breathes by the body wall, the body wall of the earthworm is densely covered with capillaries, and the oxygen in the soil is first dissolved in the mucus on the body surface, and then penetrates into the body wall, and then enters the capillaries of the body wall The carbon dioxide in the body is also discharged from the body surface through the capillaries of the body wall, and the breathing of the earthworm depends on the body wall that can secrete mucus and always keep it moist.

The structure of the body wall is composed of the stratum corneum, epidermal cells, ring muscles, and longitudinal muscles, and the muscle layer is the body cavity membrane. There are well-developed glandular cells in the epidermal cells that secrete mucus moist ** to facilitate movement in the soil.

The mode of movement is peristaltic contraction. Several somites form a group, one group of medial longitudinal muscles contract, the ring muscles relax, and the somites shorten, while pressure in the body cavity increases, and bristles stick out to attach. In the adjacent somite group, the annular muscle contractions, the longitudinal muscle relaxes, the somites lengthen, the pressure in the body cavity decreases, and the bristles are retracted.

Each somite group alternately contracts the longitudinal and annular muscles with the adjacent somite group, causing the body to move forward in waves. The earthworm can advance 2-3 cm with each contraction, and the direction of contraction can be reversed, so it can do backward movements.

1. Earthworms generally live in moist, loose, and rich in cavitary organisms. This way of life of earthworms has also evolved over hundreds of millions of years of evolution, and is rich in organic and inorganic soils.

2. Because there are many varieties of earthworms, the living environment and the food they like to eat are also different, so their living habits are also slightly different, but they like temperature, moisture, darkness, breathability, light, salt, earthquake, and spicy food are common.

**Earthworms do not have special respiratory organs, and under normal circumstances, they mainly rely on the moist body surface to complete gas exchange, so they must go to the ground to ventilate when it rains, and earthworms are rarely seen in sunny weather, because they must keep their bodies moist.

Gas exchange of earthworms:

Air (mainly oxygen) > moist body surface, capillaries, in vivo, capillaries, moist body surface, air (mainly CO2).

The earthworm breathes by the capillaries of the body wall, and its surface is densely covered with many capillaries, and the oxygen in the air will dissolve in the mucus on the surface of the earthworm, and then gradually penetrate into the body. There are more than 3,000 species of earthworms, and there are more than 200 kinds in China, and earthworms need to be provided with a temperature environment of 5 to 30 degrees when breeding earthworms, not lower than 0 degrees.

The earthworm breathes by the capillaries of the body wall, because there are a large number of capillaries distributed on the surface of its body, and the oxygen in the air will dissolve in the mucus on the surface of the earthworm, and then penetrate from the body wall to the capillaries, and the carbon dioxide in the earthworm's body will also be excreted from the capillaries.

Earthworm, also known as Dilong, belongs to the terrestrial invertebrates in the annelids, there are more than 3,000 kinds of earthworms in the world, there are more than 200 kinds in China, and the widely distributed earthworm varieties have Aisheng worm, heterolip worm, ring hairy worm, dura worm, etc., which have a certain improvement effect on the soil.

Earthworms like temperature, can grow in a temperature environment of 5 to 30 degrees, if the temperature is lower than 0 degrees may be frost damage and die, in addition to the earthworm through the ** breathing, so the breeding process should keep its body surface moisture at about 70%.

Earthworms are susceptible to viruses, fine and fungal hazards, and should be removed in time if there are discolored and hard earthworms during the breeding process. At the same time, it is necessary to reduce the density of its breeding, and use oxytetracycline to spray the breeding bed to prevent the occurrence of diseases.

Answer B analysis: The knowledge point tested in this question is the breathing process of earthworms When answering, you can start from the breathing process of earthworms

Answer: The body wall of the earthworm is densely covered with capillaries, and the oxygen in the soil is first dissolved in the mucus on the body surface, and then seeps into the body wall, and then enters the capillaries of the body wall The carbon dioxide in the body is also discharged from the body surface through the capillaries of the body wall, and the breathing of the earthworm depends on the body wall that can secrete mucus and always remain moist Mammals use their lungs to breathe, fish live in water and breathe with gills, and domestic pigeons use air sacs and lungs for double breathing

Comment: The key to answering such questions is to understand that the gas exchange of earthworms is done through the body surface

The body wall of the earthworm is densely covered with capillaries, and the oxygen in the soil is first dissolved in the mucus on the body surface, and then penetrates into the body wall, and then enters the capillaries of the body wall The carbon dioxide in the body is also discharged from the body surface through the capillaries of the body wall, and the breathing of the earthworm depends on the body wall that can secrete mucus and always remain moist Mammals breathe with lungs, fish live in water and breathe with gills, and domestic pigeons use air sacs and lungs for double breathing