The document summarizes the key components and functions of the human digestive system. It describes the six main functions of the digestive system as ingestion, motility, secretion, digestion, absorption, and elimination. It then explains each part of the gastrointestinal tract and accessory organs, including the mouth, esophagus, stomach, small intestine, large intestine, liver, gallbladder and pancreas. It details the roles of each in breaking down food, secreting enzymes and nutrients, and eliminating waste.