atrioventricular node

例句：

1. 1. The atrial node is responsible for the automaticity of the heartbeat.
   房室结负责心脏跳动的自动性。
2. 2. The atrioventricular node is located in the atrium and plays a crucial role in the conduction ofelectrical impulses.
   房室结位于心房内，对电冲动传导起着至关重要的作用。
3. 3. During the process of heart failure, the atrial node may fail to function properly, leading to irregular heartbeats.
   在心脏病过程中，房室结可能无法正常运作，导致心跳不规律。