If the earthworm is cut into two sections, the muscle tissue on the section will contract immediately, and a part of the muscle tissue will dissolve quickly to form a new cell mass. At this time, the white blood cells in the blood gather on the cut surface at the same time, forming a special embolism, which makes the wound close quickly. Its mesodermal cells are very powerful. ?
Earthworms can regenerate. The regeneration of earthworms is mainly divided into stopping pus-healing wounds-growing new heads-restoring functions. Earthworms have a short recovery time, which is different from marine animals and can be divided into two parts. I thought: Why do earthworms come back to life? It turns out that after being injured or cut off, it will produce an embryonic mesenchymal cell, which can be transformed into various tissues to survive, making the body two new earthworms. However, the severed part must not rely on the front of the head, otherwise, even mesenchymal cells can't be saved. (reprinted in? Ya Xiao yin ya)
roundworm
Protozoa, nematodes, octopus, octopus. It is the largest parasitic nematode in the human intestine. The adult is pink or light yellow with horizontal stripes on the body surface, and the tail of the male worm is often curled. Eggs are excreted with feces, and eggs are divided into fertilized eggs and unfertilized eggs. The former is golden yellow, with spherical egg cells inside and crescent-shaped gaps at the poles; The latter is long and narrow, with a group of rough refractive particles of different sizes inside. Only fertilized eggs can divide and develop. It takes about 10 days to develop into rod-shaped larvae in moist, oxygen-enriched and shaded soil at 2 1~30℃. Once peeled off, it becomes an infectious egg with infectious larvae. At this time, if swallowed, the eggshell is digested and the larvae escape in the intestine.
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