生命活动的调节是高考命题的重点,神经调节更是高频考点,其中围绕兴奋的产生与传导的电流计指针偏转问题是教学中的重点也是难点,学生的出错率较高.本文通过一道学生易错的经典习题对指针偏转问题进行解析.图1例题图1是一个反射弧的部分结构图,甲、乙表示连接在神经纤维上的电流表.当在A点以一定的电流刺激,则甲、乙电流表指针发生的变化是().A.甲、乙都发生两次方向相反的偏转 The regulation of life activities is the focus of college entrance examination proposition, neuromodulation is a high-frequency test center, in which the excitement of the generation and conduction of the current meter pointer deflection problem is the focus of teaching is difficult, the higher the error rate of students.Through a student Error-prone classic exercises to resolve the problem of pointer deflection Figure 1 Example Figure 1 is a reflection of the arc part of the structure, A, B said the nerve fiber connected to the ammeter when A point to a certain current stimulation, the A , B ammeter pointer changes (). A. A, B have occurred in the opposite direction of deflection