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【单选题】
关于平滑肌,下列哪项是错误的?
A.
分为单个单位平滑肌和多单位平滑肌
B.
内脏平滑肌细胞间存在大量缝隙连接,而单个单位平滑肌只有致密带连接
C.
内脏平滑肌中 可以有起搏细胞,使平滑肌自动产生节律性兴奋和收缩
D.
平滑肌细胞的SR不发达,也没有T管和Z盘
E.
气道和大血管的平滑肌是内脏平滑肌
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