The human digestive system begins in the mouth and ends at the anus. Enzymes in saliva break food down into smaller particles in the mouth. Food is then swallowed and goes through the digestive tract before leaving the bottom through the rectum and anus.
Once food is swallowed, it enters the esophagus and moves down into the stomach. Once in the stomach, the food is mixed with acids and enzymes to break it down even further. Next, the food travels to the small intestine, where the nutrients are absorbed from the food. Then, the food travels to the large intestine, where water and salts are absorbed. Finally, the food reaches the rectum and is excreted through the anus to complete the digestion process.