atrioventricular septum

例句：

1. 1. The atrial septum is the thin layer of tissue thatseparates the atria from the ventricles.
   房室结是分隔心房和心室的薄层组织。
2. 2.During heart failure, the atrial septum can become inflamed andthicken, leading to heart failure.
   在心脏病发作期间，房室结可能会发炎并变厚，导致心脏病发作。
3. 3.The atrial septum plays acrucial role in maintaining the proper balance betweenthe atria and ventricles.
   房室结在保持心房和心室之间正确平衡方面起着至关重要的作用。