单词：sinoatrial node
sinoatrial node的用法和样例：
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。
- When the sinoatrial node starts to malfunction it can cause dangerously slow or erratic rhythms to develop.窦房结出了问题，心律会变缓或变紊乱，这很危险。
- pacemaker带头人
- cardiac pacemaker心脏起搏器
- SA node窦房结
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