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首页 医学英语口语 口腔生理学术语D

医学英语口语 口腔生理学术语D.doc

医学英语口语 口腔生理学术语D

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2019-02-25 0人阅读 举报 0 0 暂无简介

简介:本文档为《医学英语口语 口腔生理学术语Ddoc》,可适用于外语资料领域

医学英语口语:口腔生理学术语DDarwinianmedicineanapproachtothetreatmentofinfectivediseaseswhichtakesaccountofthecoevolutionbetweenthehostanditsparasiteDeciduousfromtheLatin"falling"itappliesbothtotreeswhichlosetheirleavesinwinterandteethwhicharelosttomakewayforthepermanentsetDemineralisationreductioninamountofmineralintissueThisreductionoccurswhenthecrystalsofapatitearedissolved,usuallyinanacidenvironmentDentalabscessanabscessaroundtheapexofatoothduetospreadofinfectionfromthepulpDentalpapillathecondensationofdentalmesenchymewhichprovidesthestemcellsfromwhichondontoblasts,cementoblastsandosteoblastswillformthepulpdentine,cementumandalveolarboneofthetoothsocketDentaryoneofseveralbonewhichtogethermadeupthelowerjawinearlyreptilesDuringevolutiontheotherbones,thearticularandquadratebones,becamepartoftheinnerear,andthedentarybecamethesinglethemandibleofmammalsDentineahardmateriallikebonewhichformstherootandinnercoreofthecrownofteethUnlikebone,dentinehasfinetubuleswhichcontaintheelongatedprocessofodontoblasts,thedentineformingcellsDentinepulpatermusedtodescribetheunitybetweendentineandpulp,andtoviewitasoneintegratedtissueDepolarisationallcellshaveaslightdifferenceinelectricalpotentialbetweentheinsideandoutsideofthecellmembraneThisdifferenceiscalledamembranepotentialandisduetoagreaternumberofsodiumions(positivelycharged)outsidethecellthaninsideThisimbalanceismaintainedbyamembranepumpwhichpushessodiumionsoutofthecellAnotherpumpalsopushespotassiumionsintothecellsothereshouldbenodifferenceinthebalanceofpositiveionsButthepotassiumionsleakbackoutagain,sothereisalwaysapotentialdifferenceacrossthemembraneNervecellshavetheabilitytodepolariseorreversethemembranepotentialsothattheinsideispositiveandoutsidenegativeThisreversalisshortlivedandissooncorrected,butitislongenoughtoinfluencetheadjacentpartsofthemembraneandtobecarried,likeawave,allthewayalonganerveaxontothenextnervewhereitreachesasynapseThereversaliscausedbyasuddenopeningofcellmembranegateswhichallowafloodofsodiumionsintothecellThisfloodcausestheinsidetobecomepositive,butthegatesaresoonshutandpotassiumgatesopened,whichallowspotassiumionstofloodoutandrestorethemembranepotentialThiscanallhappenseveraltimesinonesecond,butafterawhilethereisnoflood,andthesodiumpumphastogettoworktobuildupenoughpressureforthedepolarisationtoworkagain原文来自必克英语

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医学英语口语 口腔生理学术语D

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