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In anatomy, the stomach (in ancient Greek στόμαχος) is an organ in the gastrointestinal tract used to digest food. In general, the stomach's primary function is not the absorption of nutrients from digested food; this task is usually performed by the intestine. In most animals, the main job of the stomach is to break down large fat molecules into smaller ones, so that they can be absorbed into the intestines more easily. Latin names for the stomach include Ventriculus and Gaster; many medical terms related to the stomach start in "gastro-" or "gastric".
In humans, the stomach is a highly acidic environment - maintained at pH 1.5 - 2 by the secretion of hydrochloric acid(HCl) - with peptidase digestive enzymes, primarily pepsin. Pepsinogen is secreted by chief cells of the stomach and the acidic environment activates pepsinogen to form pepsin. In fact, the stomach's interior can secrete 2 to 3 litres of gastric fluid per day.
مقاله Stomach