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1、DigestivesystemThefunctionofthedigestivesystemistopreparefoodforintakebybodycells.Nutrientsmustbebrokendownbymechanicalandchemicalmeansintomoleculesthataresmallenoughtobeabsorbedintothecirculation.Withincells,thenutrientsareusedforenergyandforrebuildingvitalcellcomponents.Digesti
2、ontakesplaceinthedigestivetract.DigestivetractThehumandigestivesystemincludesmouth,pharynx,esophagus,stomach,smallintestine(duodenum,jejunumandileum),largeintestine（cecum，appendix，colonandrectum）andanus.Mouth,oralcavityOr/o:oralcavity,oraladministrationorallanguagestomat/o:stomat
3、itis,stomatoscopysaliva:isthewaterysubstanceproducedinthemouths.Itisproducedinandsecretedfromthesalivaryglands.Humansalivaiscomposedmostlyofwater(99.5%),butalsoincludeselectrolytes,mucus,antibacterialcompounds,andvariousenzymes.Theenzymesinthesalivabreakdownsomeofthestarchandfati
4、nthefoodatthemolecularlevelsalivaryamylaseToothDent/i:Dentist:amedicalprofessionalwhospecializesinthecareofteethDentalgia:toothacheodont/o:Oligodontia:theconditionofnaturallyhavingfewerthantheregularnumberofteeth,itisalsocalledhypodontiaPeriodontitis:referstoanumberofinflammatory
5、diseasesaffectingthetissuesthatsurroundandsupporttheteethtongueLingu/oLinguisticSublingualtablet:Usuallyasmall,flattabletintendedtobeinsertedbeneaththetongue,wheretheactiveingredientisabsorbeddirectlythroughtheoralmucosaandintoblood;suchatabletdissolvesverypromptly.Nitroglyerinsu
6、blingualtablet:atypeofvasodilator.Itrelaxesbloodvessels,increasingthebloodandoxygensupplytoyourheart.Thismedicineisusedtorelievechestpaincausedbyangina.esophagusesophagusisamusculartubewhosecontractionscanpropelfoodtothestomach.eso-=inside,inwardphag/o=swallowesogastritis:Inflamm
7、ationofthemucousmembraneofthestomachphagocyte:cellsthatprotectthebodybyingestingharmfulforeignparticles,bacteriaanddeadordyingcellsStomachThethreebasic/mainfunctionsofthestomacharetokillanybacteriaingested,breakdownthefoodintosmallerpiecestocreatealargersurfaceareaforeasierdigest
8、ion,andtoholdfoodandreleaseitataconstant
