A_Digestive_System5_S10

A_Digestive_System5_ - DigestiveSystem YouAreWhatYouEat Dr.S.C.Williams 1 Introduction Locates& Uptakeofnutrients&water 30footlong, Humanshaveac

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1 Digestive System Digestive System You Are What You Eat You Are What You Eat Dr. S.C. Williams
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2 Introduction How is the digestive system important? - Locates & processes macromolecules - Uptake of nutrients & water - Supports energy demands What is the digestive system? - 30 foot long, hollow tube plus accessory organs - Humans have a complete digestive system that  continuously processes food
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3 Topics to Be Discussed What the digestive system is and does  The digestive processes General histological structure Primary digestive organs and their structures Accessory structures: teeth, tongue, liver, pancreas & glands
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4 Functions Primary: Ingestion, mastication, deglutition, secretion, digestion,  Secondary: Taste, limited excretion, water balance, immune defense,  endocrine secretion
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5 Component s Alimentary canal (gastrointestinal  tract) >> Oral cavity, pharynx, Esophagus, stomach, Anus Accessory organs: Salivary glands, tongue, Teeth, liver, gall bladder Pancreas Crouch 1985
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6 Nutritional Needs
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7 Digestive Processes Management of macromolecules Mechanical breakdown of  macromolecules Enzymatic breakdown of  macromolecules
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8 Digestive Enzymes and Their Actions
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9 The Digestive Tube Histological Structure Composed of hollow tube with  lumen and four tunics Tunica mucosa:  epithelial  lining,crypts of Lieberkuhn,  lamina propria, muscularis  mucosa Tunica submucosa Tunica muscularis: inner  circular muscle band, outer  longitudinal band Tunica serosa Tortora 1995
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10 Mouth Structure – lips, cheeks, labial, frenulum,  vestibule, oral cavity, tongue, lingual  palatine tonsils, lingual tonsils, teeth,  opening of salivary glands Palate:  hard and soft – separates oral and  nasal chambers Epithelium – stratified squamous Functions: mastication, starch digestion by  Crouch 1985
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11 Lymphoid Tissues Around Mouth Francis 1959
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12 Pharynx – a Muscular Funnel Initiates deglutition Connects mouth to  laryngeal pharynx Oropharynx vs.  Laryngeal pharynx Palate Tongue Vestibule Crouch 1985
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13 Esophagus Thin Walled, Hollow Tube Connects stomach to pharynx About 10 in. Long, posterior to trachea, collapsed Passes through diaphragm at esophageal hiatus Histological structure  – typical 4 tunics except as follows - T. Mucosa of non-keratinized stratified squamous epithelium - T. Muscularis of skeletal muscles in sup 1/3, smooth muscle in inferior 1/3 and  mixed muscle between - T. Serosa absent – replaced by T. Adventitia Sphincters
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This note was uploaded on 09/23/2011 for the course BIOL 328 taught by Professor Staff during the Spring '11 term at S.F. State.

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A_Digestive_System5_ - DigestiveSystem YouAreWhatYouEat Dr.S.C.Williams 1 Introduction Locates& Uptakeofnutrients&water 30footlong, Humanshaveac

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