在中学《生理卫生》课本里,要求通过演示实验让学生观察到“肌肉收缩是神经刺激肌肉的结果”。这首先必须配制生理盐溶液,准备电源、电极、感应圈、支架和指示器,还要准备一套制作神经肌肉标本用的解剖器。在演示中,由于手续比较复杂,花费的时间较长,不能不影响其它內容的讲授。就效果来看,只能使学生观察到指示器的小幅摆动,这对他们的印象并不十分深刻。因此,我们在讲授这一內容 In the “Physiological Health” textbook of secondary school, students are required to demonstrate through experiments that “muscle contraction is the result of nerve stimulation of the muscles.” This must first prepare physiological salt solution, prepare the power supply, electrodes, induction coil, brackets and indicators, but also to prepare a dissector for the production of neuromuscular specimens. In the demonstration, due to the more complex procedures, the longer the time spent, can not but affect the teaching of other content. From the point of view of the effect, students can only observe the small swing of the indicator, which is not very impressive to them. Therefore, we are teaching this content