A Summary of the Human Digestive System

The Stomach

The stomach is a hollow, sac-like organ connected to the esophagus and the duodenum (the first part of the small intestine). The stomach consists of layers of muscle and nerves that continue the breakdown of food, which begins in the mouth. The stomach has four functions. First, it acts as a storage bin, storing the meal for a later time. It also is a food mixer. The strong muscles contract which mash the food. The stomach also is as a sterilizing system. The cells in the stomach produce an acid, which kills germs in "bad" food. Finally, it acts as a digestive tub. The stomach produces digestive fluid which breaks down the chemicals in food to be distributed as fuel for the body.