SA node

常见例句

• Activation of the heart normally begins in the sinoatrial node.
  在正常情況下，心髒的活動始於竇房結。
• This process continues over and over as the atria refill with blood and other electrical signals come from the SA node.
  隨著心房的再次充血和竇房結電信號的再次産生，這個過程會一直重複下去。
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