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【简答题】
回答下面有关神经系统、神经调节等问题： （1）神经系统结构与功能的基本单位是______； 神经活动的基本方式是______． （2）按神经冲动在反射弧上产生和传导的顺序，反射弧的五个组成部分依次是：______、____________、______、和效应器． （3）在缩手反射中，当冲动传到效应器时，手即缩回（即屈肘）．屈肘时，手臂收缩的肌肉是______（填“肱二头肌”或“肱三头肌”），肌肉收缩所需的能量来自肌细胞进行______作用，氧化分解______物释放的能量．
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