英文医学课件：6 Circulatory system循环系统.ppt

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1、Chapter9Circulatorysystem---Closedtubularsystem---BloodcirculatoryorcardiovascularS心血管系统---LymphvascularS淋巴管系统ThecardiovascularSheartArtery动脉veinCapillary毛细血管1.    Capillaries1)LM:endothelium:basementmembrane:pericyte:/flattenedwithprocesses/function:i.  supportii.undifferent

2、iatedcellendothelialcell:processes–microvilli-like,finger-likedplasmalemmalvesicle/60-70nm,constituteabout25-35%oftotalvolume/transendothelialchannelfunction:transportlargemoleculesandstorageofmembrane(forenlarge,enlongated,pore-formedandmicrovilli)EM:classification①Continuou

3、scapillary:---Structuralfeature:endothelialcell:-moreplasmalemmalvesicles-tightjunctionbasallamina:complete---Distribution:CT,MT,lungandCNS②Fenestratedcapillary---Structuralfeature:endothelialcell:-havefenestraeorpore(60-80nminD,with4-6nmdiaphragm)basallamina:complete---Distr

4、ibution:gastrointestinaltract,endocrineglandandrenalglomerulus③Sinusoidcapillaries(enlargecapillary)---Structuralfeature:endothelium:gap,porebasallamina:incompleteorno(absent)---Distribution:liver,spleenandbonemarrow2.     Artery---largeA:aorta,pulmonarytrunk---medium-sizedA:

5、allnamedA,thediameter>1mm(radialA,ulnarA)---smallA:300um

6、ersof,circularlyelasticF:producedbySMcollagenousF:producedbySM---Tunicaadventitia:LCT–withsmallBV-vasavasorum,NFandLVexternalelasticM2)LargeA:elasticA---Structuralfeatures:a. Tunicaintimaisthick,andinternalelasticMisnotprominantb.   Tunicamedia:consistsof40-70layersofelasticm

7、embrane,CFandSMLargeAelasticMSM3)SmallA:---largeSA:internalEM3-4layersSMnoexternalM---smallSA:nointernalM1-2layersSM2.      Veins---threetype---correspondwithAexceptforLV---threelayers---structuralfeatures:a.largerdiameter,thinnerwalls-collapsedb.nointernalandexternalelasticm

8、embrane,sotheboundariesbetweenthreetunicaarenotveryclearc.containsmo