在讲《人的肌肉》一课时,教师除了指导学生活动自己的手臂,触摸臂上的肱二头肌和肱三头肌缩短和伸长外,还要利用肘关节模型,让学生清楚地看到肌肉收缩时变缩变粗,舒张时伸长变细。这里有个值得注意的问题,就是在使用肘关节 Speaking of “Human Muscles”, the teacher not only instructed the students to exercise their own arms, shorten and extend the biceps and triceps on the touch arms, but also used the elbow model to make the students clearly see When the muscle contraction becomes thicker, thinner when diastolic. There is a noteworthy problem here, is the use of elbows