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The stomach is a muscular, J-shaped organ located in the upper left portion of the abdominal cavity, just beneath the diaphragm. It plays a crucial role in the digestive system and is vital in the field of Applied Physiology, as it illustrates how anatomical structures coordinate with physiological functions to facilitate digestion and absorption. The stomach serves as a reservoir where ingested food is mixed with gastric secretions and broken down into a semi-liquid substance known as chyme before passing into the small intestine. --- ### STRUCTURE OF THE STOMACH Anatomically, the stomach can be divided into four major regions: 1. Cardia: * This is the section that connects the esophagus to the stomach. * It surrounds the lower esophageal sphincter (cardiac sphincter), which prevents the backflow of food and gastric acid into the esophagus. 2. Fundus: * This dome-shaped region is located superior to the opening of the esophagus. * It acts as a temporary storage area and participates in the production of gases during digestion. 3. Body (Corpus): * The largest central region of the stomach. * It is primarily responsible for the mixing and enzymatic digestion of food. 4. Pylorus: * This region connects the stomach to the duodenum (first part of the small intestine). * It consists of two parts: * Antrum: Acts as _________ ___ ______ ____ ____ _____ ________.
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