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Small Intestine

24.10--Small Intestine

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
Created by: 100000434525601



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