GASTROINTESTINAL SYSTEM - AN INTRODUCTION -LESSON 55
DIGESTIVE SYSTEM: INTRODUCTION TO THE DIGESTIVE SYSTEM: Digestive system is also called gastrointestinal system or alimentary canal. Digestive tract starts from the mouth and ends at the anus. Food enters into the body through the mouth and then enters into the intestines, after the food material absorbed, and the waste material excreted out from the anus. Travel track of food materials: Food travel starts first from mouth to pharynx to esophagus to stomach to duodenum where gallbladder, liver, and pancreas take part in the travel of the food then to jejunum to ileum to cecum to ascending colon to transverse colon to descending colon to sigmoid colon to rectum to anus. What happens to the food as travels when enters into the GI (gastrointestinal tract)? The food enters the body as a complex food material, we chewed the food, the saliva mixed with the food. The complex food material broken down into simpler material. The food material chemically and mechanically ...