cardiac sphincter

例句：

1. 1.The cardiac sphincter is responsible for the regulation of blood flow through the heart.
   心脏括约肌负责调节通过心脏的血流。
2. 2. The study focused on the function and structure of the cardiac sphincter.
   该研究专注于心脏括约肌的功能和结构。
3. 3. Cardiac sphincter dysfunction can lead to heart failure.
   心脏括约肌功能障碍可能导致心脏病。