DigestivetractHongya SunYangzhou University
1 Digestive tract Hongya Sun Yangzhou University
Introduction ofdigestivesystemOrganizationofdigestivesystem> consists of a long convoluted tube extending from themouth to the anus and a number of associated glands>thedigestivesystemconsistsoftwomajorsections--digestivetract:oral cavity, pharynx, esophagus, stomach,small intestine, large intestine, rectum and anus-digestiveglands(associatedglands):large gland: salivary glands, pancreas, liversmall gland:fundus gland, small intestinal gland,eto
2 Introduction of digestive system Organization of digestive system consists of a long convoluted tube extending from the mouth to the anus and a number of associated glands. the digestive system consists of two major sections -digestive tract: oral cavity, pharynx, esophagus, stomach, small intestine, large intestine, rectum and anus -digestive glands (associated glands ): large gland: salivary glands, pancreas, liver small gland: fundus gland, small intestinal gland, etc
ORGANS:ACCESSORYORGANS:Mouth·Teeth chewfood·TonguepositionsandtastesfoodPharynx-Passagewayfortood andair-Participates in swallowingSalivaryglands?Saliva moistens foodEsophagus·Bicarbonate maintainspH-Movesfoodfrompharynx-Amylase digosts starchtostomach-Lysozyme inhibits bacteriaStomachLiver-Stores and mixesfood-Produces bile-Begins chemical digestion of-Perfoms various functionsproteinbyenzymesandacidassociatedwithprocessing*Regulates deliverytotheand storing nutnientssmall intestineGall bladderLarge intestine-Stores and concentrates bile-Absorbs nutrients?Stores waste materialPancreasSecreles digestive enzynesSmall intestineinto small intestineDigestsproteins,fats-Secretes bicarbonate intoand carbohydratessmal intestine to neutralize-Absorbsmostofthenutrentsstomach acidSecretesdigestivehomonesand enzymesRectum-PassagowayfortecesAnusExpells undigested materialOutlineof DigestiveSystem
3 Outline of Digestive System
Outlineof MainFunctionof DigestiveSystemMechanicalprocessingandmovement:--chewing,mixing,etc.:Secretion:--fluid, bile, acid, alkali, mucus, digestive enzymes and hormones, etcDigestion:physical/chemical--breakingdownfoodtosmallest absorbable units (small molecules):Absorption:--through mucosa, into blood or lymph vesselsElimination:-undigestedmaterialeliminated
4 Outline of Main Function of Digestive System v Mechanical processing and movement: -chewing, mixing, etc. v Secretion: -fluid, bile, acid, alkali, mucus, digestive enzymes and hormones, etc. v Digestion: physical/chemical -breaking down food to smallest absorbable units (small molecules ) v Absorption: -through mucosa, into blood or lymph vessels v Elimination: -undigested material eliminated
Digestive tract
5 Digestive tract