神经细胞兴奋时，首先发生动作电位的部位是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30920' and id < 2488318 and id<>'2488318' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30920' and id > 2488318 and id<>'2488318' order by id asc limit 5