来自《耶鲁大学开放课程：生物医学工程探索 第13集 第13集》

• 
  
  and the minimum pressure during a heartbeat.
  最大压力和最小压力
• 
  
  The maximum pressure occurs
  当心脏有活性地收缩或跳动时
• 
  
  when the heart is actively contracting or beating.
  血压达到最大值
• 
  
  We'll talk about that more in a few minutes
  待会我们会再讲
• 
  
  and we'll talk about that in great detail on Thursday.
  下周四我们会详细讨论这个问题
• 
  
  Then it drops when the heart is relaxing.
  心脏舒张时血压降低
• 
  
  Blood pressure is generated in a cyclic fashion
  血压的产生是循环式的
• 
  
  because of beating of the heart,
  因为心脏的跳动是在不断重复
• 
  
  contract, relax, contract, relax,
  收缩 舒张 收缩 舒张
• 
  
  120, 80,
  一百二十 八十
• 
  
  120, 80,
  一百二十 八十
• 
  
  120, 80.
  一百二十 八十