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ID:40130694
大小:2.37 MB
页数:15页
时间:2019-07-22
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1、CH23:TheLymphaticSystemGoalsDiscusstheorganizationofthelymphaticsystem,includingthevessels,principallymphnodes,thymus,andspleenExplaintherelationshipbetweenthelymphaticandcirculatorysystems,andtheroleoflymphoidtissuestructuresandlymphocytesinthebody’sdefenseAccessorytocardiovascularsyste
2、mtherearetwodrainagesystemsOverviewoftheLymphaticSystemIncludes,vessels,fluid,andnodesornonsecreting"glands".Lymphaticvesselsconveyfluidfromtheperipherytotheveins.Thefluid,lymph(=clearspringwater),iswhatseepsoutofthebloodattheperipheralcapillaries.Compositionissimilartoplasmawithoutthep
3、roteinsLymphaticorgansortissues("glands")arefilteringareasandarenasoflymphocytematurationandcompetency.MajorFunctionsofLymphaticSystemFiltrationoflymphReturnofseepedfluidtoc.v.system“Education”andproductionofimmunesystemlymphocytesTransportofdigestedlipidsfromsmallintestinallactealsLymph
4、CapillariesThinwalledendothelium(noBM)withperiodiconewayvalves.Ingeneraltheyparallelveins.ClosedendsallowfluidflowinwardonlyPickupandrecycleextratissuefluidLymphcirculationdueto?ComparetoFig.23.2LocationofLymphCapillariesEverywhere,exceptforCNSandbonemarrow,aswellascorneaandcartilage.Spe
5、cialsetoflymphcapillariesinvilliofsmallintestine=LactealsDamagedvalvesorblockedlymphvessels???LymphaticvesselscomparableinstructuretoveinsLymphcapillariesconvergetobecomecollectingvesselsandendupaseitherThoracicductorrightlymphaticductThoracic(leftlymphatic)ductLeftsubclavianveinRightlym
6、phaticductRightsubclavianveinCysternaChyliFig23.4largestLymphocytesAgranulocytes-largenucleiandsmallamountofcytoplasmFunctioninidentificationandinactivation/destructionofpathogensTypesofLymphocytesTCells-cellularimmunity-specificforpreviouslyidentifiedpathogensTHelper,TKiller,TSuppressor
7、,andmemorycellsBCells-humoralimmunity-plasmacellsproduceantibodiesspecifictotheantigenorpathogen;memorycellsNKcells-non-specific,provideimmunologicalsurveillanceBoneMarrow:LymphopoiesisLymphocytesarelateralsoproducedinthymus,spleenandtonsilsFig23.7122C.t.loadedwithLymphoc
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