The alimentary tract is the long, winding tube that runs through your body from your mouth to your anus, processing the food you eat into energy and nutrients your body can use. Think of it as a disassembly line: food enters whole and gets broken down into smaller and smaller pieces as it travels through different stations, each with a specific job.

The journey starts in your mouth, where teeth grind food and saliva begins breaking it down chemically. Food then travels down your esophagus (the tube connecting your mouth to your stomach), enters your stomach (where powerful acids continue the breakdown), and moves into your small intestine (where most nutrients get absorbed into your bloodstream). Finally, what's left travels through your large intestine, where water gets absorbed, and the remaining waste exits your body.

The entire tract is about 30 feet long in adults, though it's coiled up efficiently inside you. Scientists also call it the digestive tract or the gastrointestinal tract (often shortened to the GI tract).