What is the reason why earthworms die soon in a dry environment?

Earthworms need to be moist on the surface of the body for respiration and excretion.

The oxygen in the soil is first dissolved in the mucus on the surface of the body, and then penetrates into the body wall, and then enters the capillaries of the body wall, and the carbon dioxide in the body is also discharged from the body surface through the capillaries of the body wall.

The excretory organ of earthworms is the posterior renal duct, and the general species have a pair of typical posterior renal ducts per somite, called the large renal duct. The earthworm does not have a large renal duct, but has three types of small order tubes: the small renal duct (parietalmicronephridium) is located on the inner surface of the body wall, which is very small, with 200 250 pieces per body, there is no renal orifice at the inner end, and the renal orifice opens on the body surface.

The septal micronephridiumm is located on the anterior and posterior sides of each diaphragm after the 14th somite, generally with 40 50 strips on each side, with a funnel-shaped renal orifice, cilia, and a thin renal duct with cilia in the internal organs, and an excretory duct without cilia in the lumen, which opens in the intestine.

The pharyngeal micronephridium is located on both sides of the pharynx and esophagus, without a renal orifice, and is open in the pharynx. The latter two types of renal ducts are also known as digestive renal ducts. All kinds of small renal ducts are rich in microvessels, and some of the kidney orifice are open in the body cavity, so the metabolites in the blood and in the body cavity can be excluded.

The yellow cells outside the intestine can absorb metabolites, shed them in the body cavity fluid, re-enter the renal orifice, and are excreted by the renal duct.

Therefore, if the earthworm is placed in a dry environment, the body wall becomes dry, and it cannot breathe, and it will die soon after.

The earthworm breathes the oxygen in the air The oxygen first dissolves in the mucus of the body wall, and then penetrates into the blood in the capillaries in the body wall, and the carbon dioxide in the blood is also excreted from the body through the body wall Therefore, the earthworm breathes with the moist body wall, and the oxygen in the air is the earthworm in the dry environment to dry the earthworm body surface, and the oxygen cannot be dissolved and cannot penetrate into the body wall, resulting in the earthworm being unable to breathe and dying soon Therefore, D is chosen

The reason why earthworms die soon after in a dry environment is that they do not take long to die.

The reason why earthworms die soon in a dry environment is that earthworms breathe oxygen in the air, and the oxygen first dissolves in the mucus of the body wall, and then penetrates into the blood in the capillaries in the body wall, and the carbon dioxide in the blood is also excreted through the body wall Therefore, earthworms breathe with a moist body wall, and breathe oxygen in the air. Earthworms dry the surface of the earthworm in a dry environment, and the oxygen cannot be dissolved and cannot penetrate into the body wall, resulting in the earthworm being unable to breathe and will soon die.

Earthworms are rich in nutrients and reproduce rapidly, earthworms can be used as a precious medicine for a variety of diseases, and can also be used as high-protein food and feed. Earthworms dig holes to loosen the soil, decompose organic matter, create good conditions for the growth and reproduction of soil microorganisms, and play a special role in soil improvement, eliminating public pollution, protecting the ecological environment, in material cycle, biodiversity, etc.

The earthworm breathes the oxygen in the air The oxygen first dissolves in the mucus of the body wall, and then penetrates into the blood in the capillaries in the body wall, and the carbon dioxide in the blood is also excreted from the body through the body wall Therefore, the earthworm breathes with the moist body wall, and the oxygen in the air is the oxygen in the air The earthworm dries the surface of the earthworm in a dry environment, and the oxygen cannot be dissolved and cannot penetrate into the body wall, resulting in the earthworm being unable to breathe and dying soon

Answer: A earthworm breathes oxygen in the air, oxygen first dissolves in the mucus of the body wall, and then penetrates into the blood in the capillaries in the body wall, and the carbon dioxide in the blood is also excreted from the body through the body wall Therefore, the earthworm uses the moist body wall to breathe If the earthworm is placed in a dry environment, the body wall is dry and the oxygen cannot be dissolved, resulting in the earthworm being unable to breathe and suffocating to death.

Answer C test question analysis: earthworms rely on the moist body surface to breathe, its body wall is densely covered with capillaries, the oxygen in the soil first dissolves 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 maintain a moist body wall to complete, therefore, put the earthworm in a dry environment, the body wall becomes dry, and can not breathe, and will die soon. Test Center:

This question examines the breathing of an earthworm. Comments: This question is a basic knowledge question, and the key to answering this question is to understand that earthworms breathe on a moist body surface.

Answer: The earthworm breathes by the mucus on the body surface, and there are capillaries on the inside of the earthworm's body wall, and the oxygen in the air is first dissolved in the mucus of the earthworm's body wall, and then it is exchanged with carbon dioxide in the capillaries on the inside of the body wall to complete respiration. Placing the earthworm in a dry environment causes the mucus on its body surface to lose too much water, and the earthworm suffocates to death because it cannot help complete the gas exchange.

Earthworms breathe oxygen from the air, and the oxygen dissolves in the mucus on the walls of the body.

Then it penetrates into the blood in the capillaries in the body wall, and the carbon dioxide in the blood volume is also excreted through the body wall Therefore, the earthworm breathes with the moist body wall, and the oxygen in the air is breathed The earthworm dries the surface of the earthworm body in a dry environment, and the oxygen cannot be dissolved and cannot penetrate into the body wall, resulting in the earthworm being unable to breathe and dying soon

Therefore, D,

The earthworm breathes the oxygen in the air The oxygen is first dissolved in the mucus of the body wall, and then penetrates into the blood in the capillaries in the body wall, and the carbon dioxide in the blood is also excreted from the body through the grinding body wall Therefore, the earthworm uses the moist body wall to breathe If the earthworm is placed in a dry environment, the dry body wall refers to swimming dryness and oxygen cannot be dissolved, resulting in the earthworm being unable to breathe and suffocating to death

Therefore, D,

Answer C Earthworm.

The breathing must be completed by the body wall that can secrete mucus and always keep it moist, and oxygen can only penetrate into the body wall when it is dissolved in the mucus and further complete the breathing. In dry faint high trembling plant ash.

The earthworm's body walls quickly become dry, making it unable to breathe normally. Stove defeat.