What are the main functions of stomach?

The primary function of the stomach is to digest food partly so that it can move to the small intestine. The stomach breaks down food by secreting stomach acid and enzymes to digest food and churn the food by the contraction of the stomach muscles. When the food enters the mouth, it is chewed, mixed with saliva, and swallowed, and it is swallowed and enters the esophagus.

Food travels down the throat and enters the stomach, passing through a muscular valve called the lower esophageal sphincter. It is further broken down by stomach acid and churned into a substance known as chyme. Then, food travels the pyloric sphincter and passes in the small intestine where it can be further digested.