Earthworms are warm-loving animals. In the long drought, severe winter and high temperature seasons, wild earthworms will crawl into raw soil to sleep. To raise earthworms artificially, it is necessary to adjust the temperature so that earthworms can grow and reproduce all year round. The optimum growth temperature of red earthworm is about 25℃. Earthworms are hermaphroditic animals, but they must cross.
The way of movement is peristalsis and contraction. Several body parts become a group. In one group, the internal longitudinal muscles contract, the annular muscles relax and the body segments shorten. At the same time, the pressure in the body cavity increases, and the bristles protrude and attach. In the adjacent body segment group, the annular muscle contracted, the longitudinal muscle relaxed, the body segment lengthened, the pressure in the body cavity decreased and the bristles retracted. Each sarcomere group alternately contracts the longitudinal and annular muscles with the adjacent sarcomere groups, so that the body moves forward in waves. Earthworms can advance 2-3cm each time they contract, and the direction of contraction can be reversed, so they can retreat. ?
The body cavity expands, and the expanded diaphragm is divided into segmented body cavity chambers. There are small holes and sphincter muscles in the diaphragm to control the flow of body cavity fluid from one body part to another. When the muscles of the body wall contract, the diaphragm can adjust the pressure in the body cavity and assist the extension of the body segment. There are dorsal holes in the intersegmental sulcus of the dorsal midline of the body, and the discharged body cavity fluid can make the body surface moist. The body cavity also contains suspended particles such as body cavity cells and protein.