如图是人体部分组织示意图请据图回答1当人体受到刺激时兴奋只能由a传到b而不能由b传到a的原因是神经递质通过突触时只能由突触前膜传 Template




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tomski如图是人体部分组织示意图请据图回答1当人体受到刺激时兴奋只能由a传到b而不能由b传到a的原因是神经递质通过突触时只能由突触前膜传 coloring