2012年普通高等学校招生全国统一考试理综(全国卷)
2012年普通高等学校招生全国统一考试(全国卷)理科综合 一、选择题(本题共13小题。在每小题给出的四个选项中,只有一项是符合题目要求的)1.(2012·大纲全国,1)下列关于膝跳反射的叙述,错误的是( )。A.反射活动由一定的刺激引起B.反射活动中兴奋在突触处双向传递C.反射活动的发生需要反射弧结构完整D.反射活动中需要神经递质参与兴奋的传递B 反射是指神经系统通过反射弧对内外刺激所作出的有规律的应答,A项正确;兴奋在突触处只能由突触前膜传递到突触后膜,单向传递,B项错误;只有在反射弧结构完整的条件下,反射活动才能完成,C项正确;兴奋传递时,由突触前膜释放的神经递...
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