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1、DigestivesystemThefunctionofthedigestivesystemistopreparefoodforintakebybodycells.Nutrientsmustbebrokendownbymechanicalandchemicalmeansintomoleculesthataresmallenoughtobeabsorbedintothecirculation.Withincells,thenutrientsareusedforenergyandforrebuildingvitalcellcomponents.D
2、igestiontakesplaceinthedigestivetract.DigestivetractThehumandigestivesystemincludesmouth,pharynx,esophagus,stomach,smallintestine(duodenum,jejunumandileum),largeintestine（cecum，appendix，colonandrectum）andanus.Mouth,oralcavityOr/o:oralcavity,oraladministrationorallanguagesto
3、mat/o:stomatitis,stomatoscopysaliva:isthewaterysubstanceproducedinthemouths.Itisproducedinandsecretedfromthesalivaryglands.Humansalivaiscomposedmostlyofwater(99.5%),butalsoincludeselectrolytes,mucus,antibacterialcompounds,andvariousenzymes.Theenzymesinthesalivabreakdownsome
4、ofthestarchandfatinthefoodatthemolecularlevelsalivaryamylaseToothDent/i:Dentist:amedicalprofessionalwhospecializesinthecareofteethDentalgia:toothacheodont/o:Oligodontia:theconditionofnaturallyhavingfewerthantheregularnumberofteeth,itisalsocalledhypodontiaPeriodontitis:refer
5、stoanumberofinflammatorydiseasesaffectingthetissuesthatsurroundandsupporttheteethtongueLingu/oLinguisticSublingualtablet:Usuallyasmall,flattabletintendedtobeinsertedbeneaththetongue,wheretheactiveingredientisabsorbeddirectlythroughtheoralmucosaandintoblood;suchatabletdissol
6、vesverypromptly.Nitroglyerinsublingualtablet:atypeofvasodilator.Itrelaxesbloodvessels,increasingthebloodandoxygensupplytoyourheart.Thismedicineisusedtorelievechestpaincausedbyangina.esophagusesophagusisamusculartubewhosecontractionscanpropelfoodtothestomach.eso-=inside,inwa
7、rdphag/o=swallowesogastritis:Inflammationofthemucousmembraneofthestomachphagocyte:cellsthatprotectthebodybyingestingharmfulforeignparticles,bacteriaanddeadordyingcellsStomachThethreebasic/mainfunctionsofthestomacharetokillanybacteriaingested,breakdownthefoodintosmallerpiece
8、stocreatealargersurfaceareaforeasierdigestion,andtoholdfoodandreleaseitataconstant
