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The stomach is a hollow muscular organ. The stomach is located between the esophagus and the small intestine. The stomach is involved in the second phase of digestion, following mastication (chewing). It secretes protein digesting enzymes and strong acids to aid in food digestion, through smooth muscular contortions before sending partially digested food to the small intestines. Some of the other functions are absorbing some ions, water, and some lipid soluble compounds such as alcohol, aspirin, and caffeine.