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Understanding how your digestive system is designed and how it works can help you recognize symptoms that indicate when the system isn't functioning properly. The basics of the digestive system are fairly straightforward and easier to understand than some other body systems.
The Stomach - Gastrointestinal Society
Human Digestive System - an overview
Gastrointestinal tract - Mayo Clinic
How your digestive system works
Digestion of food — Science Learning Hub
Your Digestive System & How it Works - NIDDK
Anatomy of the Digestive System
Infographic: Where does my food go after I eat it?
The Gallbladder & Liver: Function & Role in Digestion - Lesson