The stomach is an organ of the upper digestive tract and its major function is to store and liquefy food to allow its further digestion and absorption by the small intestine. Liquefaction is achieved by the action of acid, pepsin, and strong rhythmic muscle contractions. The stomach is well suited to carry out its digestive functions: it is expandable to accommodate a meal; it is muscular to allow strong contractions to mix and break up the food; and the acid and pepsin needed for digestion are released on demand from specific gland structures.

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