题目内容 (请给出正确答案)
[主观题]

The pacemaker for the heart is ordinarily the

A、sinoatrial node

B、atrioventricular node

C、atrioventricular bundle (of His)

D、subendocardial plexus

E、membranous interventricular septum

提问人:网友ncut224 发布时间:2022-01-06
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