Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In most mammals, the stomach is a hollow, muscular organ of the gastrointestinal tract, between the esophagus and the small intestine. It is involved in the second phase of digestion, following mastication. The word stomach is derived from the Latin stomachus which is derived from the Greek word stomachos which is derived from the word gastro- and gastric are both derived from the Greek word gaster. The stomach churns food before it moves on to the rest of the digestive system.
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