Curated OER
Kids Health: Digestive System
The parts of the digestive system and how they function are explained. An interactive diagram shows the location of each part of the system, and summarizes what each does. Disorders of the digestive system are also described.
Colorado State University
Colorado State University: Basic Functional Anatomy of the Digestive System
This site has a concise description of the digestive system with a nice diagram. The site also provides basic definitions of key parts.