Digestive System

**Definition:** A group of organs stretching from the MOUTH to the ANUS, serving to breakdown foods, assimilate nutrients, and eliminate waste. In humans, the digestive system includes the GASTROINTESTINAL TRACT and the accessory glands (LIVER; BILIARY TRACT; PANCREAS).

**Tree numbers:** - A03

**Synonyms:** - Ailmentary System - Alimentary System