GSU BIOL 2240 - Digestion_Nutrition_Absorption_ (23 pages)

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Digestion_Nutrition_Absorption_



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Digestion_Nutrition_Absorption_

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Pages:
23
School:
Georgia State University
Course:
Biol 2240 - Intro to Human Physiology
Intro to Human Physiology Documents

Unformatted text preview:

Digestion Nutrition Absorption Anatomy of the Digestive System 2 groups of organs Alimentary tract aka GI tract Mouth or oral cavity Pharynx throat Esophagus Stomach Small intestine duodenum ileum jejunum Large intestine and Anus Accessory organs Teeth tongue gallbladder salivary glands liver and pancreas Functions of the Digestive System Ingestion introduction of food into body by mouth Mastication chewing breaking down large particles mechanically to facilitates chemical digestion Secretion lubricate liquefy digest contents Mucus secreted along entire digestive tract lubricates food and lining coats lining and protects it from mechanical damage from acid and from digestive enzymes Bile emulsifies fats from liver and gall bladder Enzymes chemical digestion from saliva stomach pancreas small intestine Digestion Mechanical churning and chemical Absorption Movement from gi tract into circulation diffusion active transport symport exocytosis or lymph Elimination Defecation Waste products removed from body feces Oral Cavity Mastication Mechanical digestion teeth and tongue Chemical digestion Saliva Salivary amylase breaks down starch Polysaccharides into disaccharides starts chemical digestion Anti bacterial Contains lysozymes Histology of the Stomach Gastric pits openings for gastric glands Cells of gastric pits mucus mucus that protects Parietal produces hydrochloric acid Chief pepsinogen Endocrine produces hormones Secretions of the Stomach Mucus lubrication of digestive tract Pepsinogen converted to Pepsin by HCl Breaks down proteins HCl produced by parietal cells Helps convert pepsinogen to pepsin Kills bacteria Denatures proteins e g salivary amylase Stops carbohydrate digestion by inactivating salivary amylase Hydrochloric Acid Production Small Intestine Site of greatest amount of digestion and absorption of nutrients and water Divisions DuodenumJejunum Ileum Small Intestine Duodenum bile released into duodenum from gall bladder and liver Villi that contain



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