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【简答题】
如图为膝跳反射的反射弧模式图，请据图完成下列问题． （1）叩击______，发生了膝跳反射，引起膝跳反射的感受器和神经中枢分别在[______]______和[______]______． （2）神经冲动沿着反射弧传导的正确途径是（用数字和箭头表示）______． （3）用针刺激图中[2]时，人是否会有反应？______；是否会有疼觉？______． （4）听到“酸梅”流唾液属于______反射，这类反射是______特有的，必须有______中枢的参与才能完成．
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