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The stomach is a key organ in the digestive system that plays a crucial role in mechanical and chemical digestion of food. It is a J-shaped, muscular, hollow organ located in the upper left quadrant of the abdominal cavity, just below the diaphragm. It connects the esophagus to the small intestine and acts as a temporary storage and processing site for ingested food. The structure and functions of the stomach are intricately designed to facilitate digestion through muscular movement and secretion of gastric substances. Structure of the Stomach The stomach is anatomically divided into four major regions: 1. Cardia: This is the uppermost section of the stomach where the esophagus opens into it. It contains the lower esophageal sphincter, a ring of smooth muscle that controls the passage of food from the esophagus into the stomach and prevents reflux. 2. Fundus: Located above the level of the esophageal opening, the fundus serves mainly as a storage area for undigested food and gases released during chemical digestion. 3. Body (Corpus): This is the central and largest region of the stomach. It functions as the primary site for mixing and enzymatic digestion. 4. Pylorus: The pyloric part includes the antrum and canal, which narrows as it ______ _______ ______ _________ _______ ____ ______ _______ ___.
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