Digestive System Flashcards
Pancreas
Delivers pancreatic juice into duodenum vis pancreatic duct to assist absorption
Liver
Produces bile necessary for emulsification and absorption of lipids
Gallbladder
Stores, concentrates, and delivers bile into duodenum via common bile duct
Small intestine
Major site of digestion and absorption of nutrients and wanted in GI tract
Intestinal glands
Secret intestinal juice to assist absorption
Absorptive cells
Digest and absorbs nutrients
Goblet cells
Secret mucus
Enteroendocrine cells (s,cck, k)
Secrete secreting, cholecystokinin, and glucose dependent insulinotropic peptide
Planets cells
Secrete lysosome and phagocytosis
Duodenal glands
Secrete alkaline fluid to buffer stomach acids and mucus for protection and lubrication
Circular folds
Folds of mucosa and sub mucosa that increase surface area for digestion and absorption
Villi
Finger like projections of mucosa that are sites of absorption for digested food and increase surface area for digestion and absorption
Microvilli
Microscopic, membrane covered projections of absorptive epithelial cells that contain brush-border enzymes and increase surface area for digestion and absorption
Segmentation
Type of peristalsis: altering contractions of circular smooth muscle fibers that produce segmentation and resegmentation of secretions of small intestine; mixes chyme with digestive juices and brings food into contact with mucosa for absorption
Migrating motility complex (MMC)
Type of peristalsis: waves of contraction and relaxation of circular and longitudinal smooth muscle fibers passing the length of the small intestine; moves chyme toward ileocecal sphincter
