The document summarizes the key components and functions of the digestive system. It describes the organs that make up the digestive tract, including the mouth, esophagus, stomach, small intestine, large intestine and associated structures like the liver, gallbladder and pancreas. It explains the three main stages of digestion: breakdown of food, absorption of nutrients, and metabolism. The digestive system works in an organized way to break down ingested food into smaller molecules that can be used by the body.

1. Chapter 14 The Digestive System and Body Metabolism