23. The Digestive System
The Stomach
20PRACTICE PROBLEM
The following diagram shows the structure that produces a carpet of mucus that protects the stomach from acid. This structure is called:
![](https://lightcat-files.s3.amazonaws.com/problem_images/14e19de845a94269-1690554007440.jpg)
The following diagram shows the structure that produces a carpet of mucus that protects the stomach from acid. This structure is called: