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蠕虫是软体的,无骨骼,借肌肉的伸缩而蠕动的多细胞动物。在自然界大多数营自生生活,只有其中的一部分寄生在动物或植物体内。寄生在人体内的蠕虫主要包括线形动物门的线虫纲;扁形动物门的绦虫纲及吸虫纲;棘头动物门的棘头虫纲。第一节线虫一、线虫特征 1.虫体一般呈圆柱形,左右对称,体不分节,细的呈线状或丝状,粗的呈蚯蚓状。 2.消化道完整,有口、咽、食道、肠管及肛门。 3.雌雄同体,通常雄小雌大,雌虫尾端多垂直,
Worms are soft, boneless, multi-cellular animals that are peristaltic with muscle stretching. Most battalions in nature make their own living, and only a few of them are parasitic in animals or plants. The parasites in the body of the main worms include linear nematode Gang door; flat animal door tapeworm and Trematoda; The first section of a nematode, nematode characteristics 1 worms generally cylindrical, symmetrical, body regardless of section, fine was linear or filamentous, coarse was earthworm-shaped. 2. Digestive tract integrity, there are mouth, pharynx, esophagus, intestine and anus. 3 hermaphroditism, usually male and female adolescent, the female tail more vertical,