DigestiveSystemThedigestivesystemisresponsibleforbreakingdownfood,absorbingnutrientsfromthefood,andriddingthebodyofwasteproductsfromthefood.Itisroughlyninemeterslongandbeginsatthemouthandendsattheanus.Themouth,ororalcavity,isthefirstpartofthedigestivetract.Itisadaptedtoreceivefoodbyingestion,breakitintosmallparticlesbymastication,andmixitwithsaliva.Thelips,cheeks,andpalateformtheboundaries.Theoralcavitycontainstheteethandtongueandreceivesthesecretionsfromthesalivaryglands.Kidshave20teeth,butbythetimetheyarefullygrown,theyshouldhave32teeth(somepeopledohaveless!).Theesophagusisthesecondsteptodigestionandcloselyfollowstheoralcavity–onceswallowinghasinitiated.theAlimentaryTractThreepairsofmajorsalivaryglands(parotid,submandibular,andsublingualglands)Salivacontainswater,mucusandenzymeamylase.FunctionsIthasacleaningactionontheteeth.Itmoistensandlubricatesfoodduringmasticationandswallowing.Itdissolvescertainmoleculessothatfoodcanbetasted.Itbeginsthechemicaldigestionofstarchesthroughtheactionofamylase,whichbreaksdownpolysaccharidesintodisaccharides.theAccessoryOrgans

Liveristhelargestglandinthebody.Onthesurface,theliverisdividedintotwomajorlobesandtwosmallerlobes.Itoverliesandalmostcompletelycoversthestomach.FunctionssecretionsynthesisofbilesaltssynthesisofplasmaproteinstoragedetoxificationexcretioncarbohydratemetabolismlipidmetabolismproteinmetabolismfilteringThe