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Digestive System
| Term | Definition |
|---|---|
| Gastrointestinal Tract (GI) | long tube in the body where food is digested, nutrients are absorbed, and waste is removed |
| Oral Cavity (Upper GI) | the mouth, where food enters and chewing begins |
| Pharynx (Upper GI) | the throat, passageway for food and air |
| Epiglottis (Upper GI) | small flap that closes over the airway so food doesn’t enter the lungs |
| Esophagus (Upper GI) | muscular tube that moves food from the throat to the stomach |
| Stomach (Upper GI) | muscular organ that churns food and mixes it with digestive acids |
| Small Intestine (Upper GI) | long coiled tube where most digestion and nutrient absorption occur |
| Duodenum (Upper GI) | first section, receives bile and pancreatic enzymes |
| Jejunum (Upper GI) | middle section, major site of nutrient absorption |
| Ileum (Upper GI) | final section, absorbs remaining nutrients especially B12 and bile salts |
| Trachea (Upper GI) | windpipe, a tube that carries air from the throat to the lungs |
| Cecum (Lower GI) | pouch that connects the small intestine to the large intestine |
| Large Intestine (Lower GI) | absorbs water and forms stool |
| Ascending Colon (Lower GI) | moves stool upward on the right side |
| Transverse Colon (Lower GI) | moves stool across the abdomen |
| Descending Colon (Lower GI) | moves stool downward on the left side |
| Sigmoid Colon (Lower GI) | s-shaped segment leading to the rectum |
| Rectum (Lower GI) | stores stool before elimination |
| Anus (Lower GI) | opening through which stool exits the body |
| Salivary Glands (Accessory Organs) | produce saliva to start digestion and help swallowing |
| Teeth (Accessory Organs) | break down food mechanically |
| Tongue (Accessory Organs) | helps with chewing, swallowing, and taste |
| Uvula (Accessory Organs) | soft tissue that helps with swallowing and speech |
| Liver (Accessory Organs) | produces bile to digest fats and performs metabolic functions |
| Pancreas (Accessory Organs) | produces digestive enzymes and regulates blood sugar |
| Appendix (Accessory Organs) | small pouch attached to the cecum; may support gut immunity |
| Sphincters | circular muscles that open and close passages in the GI tract |
| Upper Esophageal | controls entry of food from the throat into the esophagus |
| Lower esophageal (Cardiac) | prevents stomach acid from flowing back into the esophagus |
| Pyloric | controls the release of stomach contents into the small intestine |