Wikipedia, the free encyclopedia. Guide to Physics, Chemistry, Biology and Environment. BBC - Homepage. Rader's BIOLOGY 4 KIDS.COM - Biology basics for everyone! National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) On this page: What is the digestive system?
The digestive system is made up of the gastrointestinal (GI) tract—also called the digestive tract—and the liver, pancreas, and gallbladder.