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Junior High
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大至急.ᐟ.ᐟ.ᐟ.ᐟ.ᐟ.ᐟ

刺激の伝わる回路で
感覚神経→(せきずい)→脳→(せきずい)→運動神経
だと思っていたのですが、途中二箇所ある(せきずい)はいらないのですか?

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