【单选题】【消耗次数：1】
大脑和神经系统的基本单位是（）。
①
树突
②
轴突
③
突触
④
神经元
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神经元的轴突和树突在形态结构上最主要的不同点是（）
①
树突有分支，而轴突没有分支
②
树突直径粗细均匀，而轴突直径则粗细不均
③
轴浆内有神经原纤维，而树突的细胞质内则没有神经原纤维
④
轴浆内没有尼氏体，而树突的细胞质内则有尼氏体
⑤
树突分支多，而轴突没有分支
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