（一）重症肌无力是横纹肌突触后膜nAChR自身免疫性疾病神经肌肉接头是通过接受乙酰胆碱（ACh）及烟碱等兴奋性递质传递与肌膜受体结合，导致离子通道开放，Na+</sup>内流，肌膜去极化，产生终板电位，肌丝滑行，因而引起肌肉收缩。
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