Why can earthworms be reborn when they are broken? Why do earthworms survive when they are broken?

It's fake, it's just that it's dying very slowly.

When the earthworm is cut off, a new cell mass will form on the cross-section, and an embolism will be formed to close the cross-section, preventing blood loss, tissue fluid loss and microbial invasion. In this way, closed body cavities are re-formed, and they are likely to survive.

Earthworm habits. 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.

The body cavity is well developed, and at the same time, it is also divided into body chambers arranged in segments by a well-developed diaphragm. There are small holes and sphincter muscles in the diaphragm to control the flow of fluid from one somite to another. When the muscles of the body wall contract, the diaphragm muscle regulates the pressure in the body cavity and assists in the extension of the somite.

There is a dorsal foramen at the intersegmental sulcus in the dorsal midline of the body, and the discharged body cavity fluid can moisten the body surface. Body cavities also contain body cavity cells, proteins, and other particles in suspension.

Hello dear, the earthworm can still live if it is broken: after the earthworm is cut in two, the muscle tissue on the section will strengthen the contraction, and some muscle tissue will quickly dissolve, and then form a new cell mass. With the continuous proliferation of cells, a new head will grow on the section of the missing head, and a tail will grow on the cut surface of the missing tail, so that an earthworm will become two complete earthworms.

Because the internal structure of an earthworm is repeated and repeated, if it is cut right into its heart, it will not be able to live in either section. If you cut exactly to the part that separates the repetitions, then both sections will survive.

Earthworms themselves are eukaryotic cell organisms, to be precise, they may not grow into two, earthworms are a relatively higher kind of annelids, the structure is more complex than many annelids, and there is a digestive system and a circulatory system.

It also has dorsal blood vessels, if it loses too much blood during cutting, it may not become two, and there are many external factors that can affect its growth, if it can survive under the conditions of temperature, pH and sterilization.