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1、口腔生理学术语(E)Ecologicalbalance-astablebalanceinthenumbersofeachspeciesinanecosystem.Intheecosystemofthemouththisbalanceisbroughtaboutbypetitionandcooperationbetandthehostsdefences-astableenvironmentinberofdifferentformsoflife,eachaffectingtheother.Exampleareaforest,desert,tidalarea,s
2、oil,oralcavity,gut.Ectoderm-theouterofthethreecelllayers,astheclumpofearlyembryoniccellsbeginstodifferentiate.Theectodermtheepidermisoftheskinandthenervoussystem.Theothertesodermandtheendoderm.Ectomesenchyme-anamegiventodentalMESENCHYMEalorigin.Eicosanoids-areaclassofhormonesadefr
3、omphospholipids.Theyincludeprostaglandins,thromboxanes,andleucotriens.Elasticfibres-arelong,thin,ribbons-likefibres,sometimesevensheet-like.Theyareposedofacentralcoreofelastin,arubberyprotein,surroundedbyglycoproteinmicrofilaments.Elastinisfoundalloverthebodybutparticularlyintheen
4、tsofanatombeesarelativelypositivelychargedion.Ithasbeenionised.ElectronTransportSystem-Hydrogenionsproducedduringthe3preparatorystepsofaerobicrespirationarecarriedbynicotinamideadeninedinucleotide(NAD).ThehydrogenionplusoneelectronformNADH,.Thistransportsystemisrunbyaseriesof5mole
5、cules.Thefirst,removesthetNADH,(oneesfromthehydrogenatom,leavingbehindahydrogenion).Thesetthefirstmoleculeinthetransportsystemtothesecond,third,forthandthenlastone,cytochromeoxidase,sareattractivetothehydrogenionsandtheybinetoformallbattery.Thisbatteryhasbeenmadebypumpinghydrogeni
6、onsoutoftheinnermembraneofthemitochondria.Thecollectionofhydrogenionsoutside,pilesupandtheirelectricalpressuremounts.Theyembrane,andarealloetopassbackthroughtheenzymeATPsynthase.Thisenzymesitslikeaembrane,turnedbythepassageofhydrogenions.Itsturningoleculeineveryturn.Theaybegoingat
7、about200revolutionspersecond,pooleculeedinthisandforpoelprisms-rod-likebundlesofhydroxyapatiecrystalscanbetracedfromtheoutsideoftheenamelalltheel-theouterlayerhardlayerelconsistsofcloselypackedcrystalsofhydroxyapatiteaterial.Arecognisableunitofstructureinenamelistheenamelprism.Ena
8、meloid-atypeofenamelfoundinfishan
