题目内容
（请给出正确答案）
A、sinoatrial node
B、atrioventricular node
C、atrioventricular bundle (of His)
D、subendocardial plexus
E、membranous interventricular septum
简答题官方参考答案
（由简答题聘请的专业题库老师提供的解答）
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