water - 副本.ppt

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1、water演讲：徐丹单词：刘晓彬回答：童莉ppt：张敏敏Waterwaterasapercentageofbodyweight水作为身体重量的百分比functionsofwaterspecialcharacteristicsofwater水的特殊特性Waterisofvitalimportancetothebodyandconstitutesthegreatestportionofbodyweight.Thehumanbodyconsistsof45%to75%water,dependingonageandsex.水是至关重要的,是对身体体重最大的一部分。人的身体有45%至75%

2、的水,根据年龄和性别有所不同。WaterasapercentageofbodyweightWaterCompartmentInfant(%)Adult(%)ManWomanElderlyPerson(%)ExtracellularIntravascularInterstitialIntracellularTotalbodywater4254115105154845352577605045Water(H2o)isvitaltohumanlife.Thebodycannotcarryonmostofitsactivitieswithoutit.Waterperformsmanysig

3、nificantfunctionsinthehumanbody.Itprovidesanefficientmediumfordeliveryofnutrientstothecellsandexportofwasteproductsfromthecells.Itisespeciallyimportantinregulationofbloodpressureandfluidandelectrolytebalance.流体和电解质的平衡Primarysolvent主要溶剂withinthebodyPrimarycompoundinallbodyfluids在所有体液中主要化合物Susp

4、ensionagentHelpsregulatebodytemperature,bodypH,andfluidpressuresinsideandoutsidecellsAssistsorparticipatesinchemicalreactionsMaybeendproductofchemicalreactions可能是化学反应的最终产物TransportsnutrientsandoxygentocellsTransportswasteproductsawayfromcellsActsas"bumper"toprotectcellsandorgansLubricatestopr

5、eventouterwalls(parietal)fromrubbingagainstinnerwalls(visceral)oforgansWaterinsolutionwithothersubstancesParticipatesinmaintenanceofbloodpressureHelpsregulateacid-baseandfluid-electrolytebalanceFacilitatestheuseofwater-solublevictamins(CandB-complex)便于使用的水溶性victaminsWaterinSolutionwithOthersu

6、bstancesSpecialcharacteristicsofwaterAgreatdifferenceintemperatureisneededtobringaboutaphysicalchangeinwater.Waterdirectlyandindirectlyparticipatesinallchemicalreactionsthatoccurinthebody.Waterisagoodsolvent.Waterexertspressureagainstthewallsorvesselsthatcontainit.Agraetdifferentintemperature

7、isneededtobringaboutaphysicalchangeinwater.Waterboilsat100℃(212℉）andfreezesat0℃(32℉).Watercanbecomeasolid,aliquid,oragaswithonlyatemperaturechange.Watertemperature,however,changerelativelyslowly.Itneedsheattochangefromaliquidtoagas.Theevapora