【单选题】
佝偻病的发生是由于缺乏（ ）．
①
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②
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③
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④
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【单选题】
在突触的描述中，哪一项错误（ ）。
①
突触也指神经元与肌细胞、腺细胞等之间的特化的细胞连接
②
突触分电突触和化学性突触两类
③
化学性突触由突触前成分、突触间隙和突触后成分组成
④
突触前膜和突触后膜上均具有神经递质的受体
【单选题】
在突触的描述中，哪一项错误（ ）。
①
突触也指神经元与肌细胞、腺细胞等之间的特化的细胞连接
②
突触分电突触和化学性突触两类
③
化学性突触由突触前成分、突触间隙和突触后成分组成
④
突触前膜和突触后膜上均具有神经递质的受体
【单选题】
在突触的描述中哪一项错误：
①
突触是神经元与神经元之间特化的细胞连接
②
突触也是神经元与肌细胞、腺细胞等效应细胞之间特化的细胞连接
③
突触分电突触和化学性突触两类
④
化学性突触由突触前成分、突触间隙和突触后成分组成
⑤
突触小泡内含神经递质的受体
【单选题】
关于非突触性化学传递的叙述，错误的是
①
结构基础为曲张体
②
曲张体与效应细胞形成突触联系
③
中枢和外周神经系统内都有该传递方式的存在
④
单胺类神经纤维都能进行非突触性化学传递
⑤
传递时间较长
【单选题】
关于兴奋性突触传递的叙述，哪一项是错误的（）
①
突触前轴突末梢去极化
②
Ca<sup>2+</sup> 进入突触前膜内
③
Na<sup>+</sup> 进入突触前膜内
④
突触后膜对Na<sup>+</sup> 、K<sup>+</sup> ，特别是对Na<sup>+</sup> 的通透性增高
⑤
突触后膜去极化达阈电位时，突触后神经元发放冲动