The document compares parts of the digestive and nervous systems to aspects of school. It describes how the mouth is like the entrance of school, the esophagus is like a hallway, the liver is like a sink, the large intestine is like a classroom, the stomach is like the library, the pancreas is like a peer mediator, the small intestine is like children, and the rectum is like the exit of school. It also explains that the cerebrum is like the principal, the thalamus is like how students bring home messages, and the brain stem is like the lunch monitoring room. Finally, it states that the nervous system controls the digestive system and body, and they work together.