The stomach is a saclike organ of digestion, and the walls are made up with layers of muscles. As the food from the esophagus enters the stomach, muscle contractions began to churn and mix the food. The stomach produces gastric juice to digest the food. The gastric juice contains enzymes that begin the digestion of proteins, which is the only thing that is partially digested. The food is mixed and churned with stomach fluids until it produces chyme, and it is passed from the stomach to the small intestine.
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