紧张的结局不自由

**神经末梢**是覆盖着髓鞘的收缩神经或肌纤维。当神经冲动兴奋肌肉时，它会穿过鞘，同时释放神经递质，释放到神经元间裂中。神经递质除了乙酰胆碱之外，还可能是另一种神经递质——

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Dr. William Whitbourne

Dr. William Whitbourne