cardiac sphincter (noun)

1. In the cartoon, the character swallowed a bomb but it got stuck at the cardiac sphincter.

2. In the movie, the protagonist had to undergo surgery to repair a damaged cardiac sphincter.

3. The horror film featured a scene where a demon possessed a person's cardiac sphincter, causing them to experience excruciating pain.

4. In the science fiction novel, humans had advanced technology that allowed them to control their cardiac sphincter and prevent acid reflux.