What are the characteristics of earthworms What are the characteristics of earthworms What are the c

Earthworms are invertebrates that belong to the genus Orthoworms of the family Orthogonaceae of the order Oligochaetae. Their body is cylindrical, 11-38 cm long and 5-12 mm wide, and consists of many links. The head consists of two parts, the anterior oral lobe and the perioral segment, which has a mouth on the ventral side and is covered with fleshy lobes.

Earthworms have a purplish-gray dorsal color, a slightly lighter posterior color, and bristles slightly whiter, at 14-16 nodes. 1 female reproductive pores and 1 pair of male reproductive pores.

Earthworms are widely distributed and are found almost all over the world. There are more than 3,000 known species of earthworms, of which about 3 4 are terrestrial earthworms, and there are more than 170 species of earthworms in China. Earthworms often inhabit the surface soil with high temperature and more humus, and generally grow in the soil layer under the pile of leaves, long-term accumulation of animal manure and rotten straw, and the depth of the habitat is generally 15-20 cm.

Earthworms are very sensitive to light and are afraid of light, salt, and tannin flavor. Gather in a dry environment and do not eat or move to reduce consumption. Earthworms feed on organic matter such as rotting fallen leaves, dead grass, and vegetable crumbs.

Earthworms are very reproductive, laying eggs 4 times a year, with an average of 50-100 eggs per reproduction. The lifespan of earthworms is generally 1-3 years. Earthworm is known as Dilong in traditional Chinese medicine, and is one of the traditional Chinese medicinal materials, and medical works such as "Qianjin Fang" and "Compendium of Materia Medica" describe the use of earthworms in medicine and medicinal use.

Earthworms have salty taste, cold nature, and regulate two ways, which have the effects of clearing heat, calming the liver, and relieving asthma, and are used for convulsions, eye redness, stroke and other symptoms. Earthworms are rich in protein and a variety of amino acids, is a good protein feed, livestock and poultry feeding can promote growth, fattening, and egg. Earthworms can also loosen soil, improve aggregate structure, improve soil acidity and alkalinity and improve fertility, promote the activity of nitrifying bacteria in the soil, keep the soil moist, and increase crop yields.

The role of earthworms! It should be loosening the soil, fishing, making feed, feeding the chickens directly, and good earthworms can be exported. Features!

It should be: earthworms have red blood, and if the earthworm's body is accidentally cut off when ploughing the land, you can see red blood flowing from the wounded surface. Most of the blood is water, as well as oxygen, carbon dioxide, sugars, amino acids, inorganic salts, and other molecules and ions dissolved in it.

The red color of blood is due to the presence of hemoglobin molecules that carry oxygen. This is similar to that of vertebrates, but it has no red blood cells (red blood cells) and hemoglobin dissolves in the blood. In this way, the efficiency of oxygen delivery is relatively low.

Earthworms also have a complex vascular system and are distributed in a capillary network. ** Secretes mucus and moists, which earthworms use to breathe, oxygen enters the bloodstream, and carbon dioxide is excreted. Earthworms have a network of capillaries throughout their bodies, where various substances are exchanged, including tissue cells to obtain oxygen and excrete carbon dioxide.

In this way, the blood always flows in a closed system of tubes, like all vertebrates, which we call a closed circulation. Blood flows through closed tubes, and there must be a pump of life – the heart. The earthworm is very special, just as its body is divided into segments without obvious merger, and its heart is also divided into several segments with the front part of the body, generally 4 5, in the form of a ring, like a bulging blood vessel, so there are also called ring blood vessels.

The dorsal surface of the annular heart is connected to the dorsal blood vessels from the back to the front, and the ventral surface is connected to the anterior to the posterior abdominal vessels, and the abdominal blood vessels also have branches that connect to the anterior to the subneural vessels. Compared to blood vessels, the annular heart has thicker muscle walls that can pulsate, and there are valves that open in one direction to ensure blood flow from the dorsal blood vessels to the abdominal blood vessels. Basically, blood flow is powered by the beats of these separate ring-shaped hearts, which are from back to front (in dorsal vessels), from back to abdomen (ring heart), and from front to back (celiac and subneural vessels).

Hope it helps!