24.10--Small Intestine
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| Small Intestine | Most digestion and absorption of nutrients; Most surface area
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| 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
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| Plicae Circulares | Folds of Mucosa in Small Intestine; Epithelial tissue is lined with villi. Feature many goblet cells
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| Duodenum | First segment of small intestine; Brunner's glands in Submucosa
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| Brunner's Glands | Alkaline mucus to neutralize gastric acid in chyme from pylorus.
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| Submucosa of Small Intestine | Features Lacteal lymphatic vessels, and lymphatic tissue extends through muscularis mucosae into submucosa
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| 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
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| Muscularis -- Migrating Motility Complex | Waves of Contraction and Relaxation of Circular and Longitudinal Smooth Muscle Fibers passing the length of small intestine
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