What does the stomach do?

The main job of the stomach is to digest proteins. It then allows the mixture of food and enzymes called 'chyme' to enter the duodenum in order for all the other food types to be digested such as carbohydrates and fats. The stomach is one of the principal organ in your digestive system. The stomach holds the swallowed food for up to four hours depending on the amount of food, churning it to a pulp and initiating digestion, then passes it on by degrees into the duodenum.
The function of the stomach is to store and digest food. It is responsible for the second phase of digestion, where stomach walls release enzymes and churn the contents.