Q5. Describe the structure and functions of the stomach with a labeled diagram.
Key Points:
- The stomach is a J-shaped organ connecting the esophagus to the duodenum, divided into cardia, fundus, body, and pylorus.
- Internal lining features rugae (folds) for expansion and gastric glands for producing gastric juice.
- Stomach functions include temporary food storage and mechanical digestion, converting food into chyme.
- Chemical digestion of proteins begins in the stomach via HCl (denaturation) and pepsin (from pepsinogen).
Answer: The stomach is a J-shaped, muscular organ of the alimentary canal, situated in the upper left quadrant of the abdominal cavity. It serves as a critical link between the esophagus and the small intestine, primarily functioning in food storage, mechanical processing, and initial chemical digestion of proteins. Anatomically, the stomach is divided into four main regions. The cardia is the narrow superior region where the esophagus enters, while the fundus is the dome-shaped portion extending super...