SA node

常见例句

• Activation of the heart normally begins in the sinoatrial node.
  在正常情况下，心脏的活动始于窦房结。
• This process continues over and over as the atria refill with blood and other electrical signals come from the SA node.
  随着心房的再次充血和窦房结电信号的再次产生，这个过程会一直重复下去。
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