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按初中《动物学》课本对蚯蚓实验要求是先观察蚯蚓的外部形态和运动状况,后用浸制标本进行解剖。这样安排的缺点是:(1)需要活和死蚯蚓各一条;(2)浸制标本的甲醛气味,会使一些学生头昏;(3)解剖的是死材料。如果改用酒精麻醉则只需一条活蚯蚓,避免了强烈刺激性气味,还能观察蚯蚓在麻醉状况下的一些生命现象:如在剪开蚯蚓体壁,观察内部器官的构造时,
According to junior high school “zoology” textbook earthworm experiment requirements is to observe the external morphology and movement of earthworms, after the dissection specimens with dissection. The disadvantages of this arrangement are: (1) the need to live and die each of the earthworms; (2) the formaldehyde smell of the dipped specimens causes some students to become dizzy; and (3) the dissected material is dead. If you switch to alcohol anesthesia, you only need a live earthworm, to avoid the strong irritating odor, but also observe some of the life-worms of earthworms under anesthesia conditions: cut earthworm body wall, observe the structure of the internal organs,