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Small Intestine
24.10--Small Intestine
Term | Definition |
---|---|
Small Intestine | Most digestion and absorption of nutrients; Most surface area |
Functions | 1) Mix Chyme with digestive juices and absorption; perstalsis moves through 2) Completes digestion of carbs, protein, and lipids; begins and completes nucleic acids 3) Absorbs about 90% of nutrients and water |
Plicae Circulares | Folds of Mucosa in Small Intestine; Epithelial tissue is lined with villi. Feature many goblet cells |
Duodenum | First segment of small intestine; Brunner's glands in Submucosa |
Brunner's Glands | Alkaline mucus to neutralize gastric acid in chyme from pylorus. |
Submucosa of Small Intestine | Features Lacteal lymphatic vessels, and lymphatic tissue extends through muscularis mucosae into submucosa |
Muscularis -- Segmentation | Type of peristalsis; Alternating contractions of circular smooth muscle fibers that produce segmentation; mixes chyme with digestive juices and brings food into contact with mucosa |
Muscularis -- Migrating Motility Complex | Waves of Contraction and Relaxation of Circular and Longitudinal Smooth Muscle Fibers passing the length of small intestine |