来自《耶鲁大学开放课程：生物医学工程探索 第15集 第15集》

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  then the contraction follows the action potential
  收缩紧随动作电位
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  by about 100 milliseconds.
  大约间隔100毫秒
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  As the contraction happens--as the action potential happens
  收缩发生后-- 当动作电位发生后
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  the contraction happens about 100-150 milliseconds after that,
  大约100-150毫秒 开始收缩
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  the maximum response;
  这时最长的反应时间
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  but these things are coupled but they're not simultaneous.
  这两件事情是耦联相关的但不是同时发生的
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  I think I've covered what's shown in this slide here.
  我觉得这张幻灯以及包括了全部的内容
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  This is just a simpler version of what we've talked about,
  这只是我们所讨论内容的一个精简版
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  generation of the signal in the SA node,
  从窦房结中发出信号
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  movement to the AV node,hesitation.
  传至房室结 延迟
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  Then,movement of this signal down the septum in between the left
  接着 信号沿着左右心室的室间隔
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  and the right ventricle,
  向下传导