来自《耶鲁大学开放课程：生物医学工程探索 第15集 第15集》

• 
  
  we were talking about last time.
  那种方式控制心跳功能
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  So how does the heart solve this problem of control
  那么心脏是如何解决这一问题的
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  of how this wave of action potential moves
  如何控制在心脏表面传播的
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  over the surface of the heart?
  动作电位的呢
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  Well,it does that through a specialized group of pathways
  其实心脏是通过一些特殊途径来实现控制的
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  that are collectively called the cardiac conduction system.
  这些途径统称为心脏传导系统
• 
  
  This is a terrible diagram.
  这是一张可怕的图表
• 
  
  I'm going to show you the next one,
  我会给你们看下一张
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  I'll show you a little bit better on the next one,
  下一张好看一些
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  and so you'll see,
  你们看到
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  it but imagine--just look at the surface here.
  想象一下 -- 只看这个表面
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  This is the heart,
  这是心脏