生理3.docx
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生理3.docx
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生理3
CalciumreleasefromtheSRcontributesmoretocardiaccontractionthaninflowofCa++acrossthesarcolemma.A.TrueB.False
Question#2Calciumremovalfromthecytoplasmaftercontractionofthemyocardiumis:
A.DependentontheT-typecalciumchannelB.Regulatedbyphospholamban
C.Augmentedbythedihydropyridinereceptor
D.b&c
Question#3Indicatewhetherthefollowingstatementistrueorfalse.
TheFrank-StarlingRelationshippartiallyexplainshowcardiacoutputcanbestabilizedinapatientafteramodestmyocardialinfarction.
A.TrueB.False
Question#4Indicatewhetherthefollowingstatementistrueorfalse.
Ventricularfillingstartsduringisometricrelaxation.
A.TrueB.False
Question#5
Whichofthefollowingfactorsincreasepreload?
A.Increasedbloodvolume
B.Horizontalpostureornegativeintrapleuralpressure
C.IncreasedsympathetictonetoveinsD.Skeletalmusclemuscularactivity
E.alloftheabove
Answer:
1.A2.B3.A4.B5.E
TheArterialSystemQuestion#1
Areductioninarterialcomplianceresultsin:
A.ariseinsystolicarterialpressurebutareductioninmeanarterialpressure.
B.ariseinsystolicandinmeanarterialpressure.
C.ariseinsystolicbutnosignificantchangeinmeanarterialpressure.
D.ariseinsystolicandanevengreaterriseindiastolicarterialpressure.
E.afallinsystolicbutariseindiastolicarterialpressure.
Question#2Whichisincreasedbyanincreaseintotalperipheralresistanceinanoldarterioscleroticindividual:
A.MeanarterialpressureonlyB.PulsepressureonlyC.Bothoftheabove
D.Neitheroftheabove
Question#3Whichis/areincreasedbyatwo-foldincreaseinheartratesimultaneouswitha25%reductioninstrokevolume?
A.MeanarterialpressureonlyB.Pulsepressureonly
C.BothoftheaboveD.Neitheroftheabove
Question#4
Increasesinarterialcapacitanceandstrokevolumewillaffectthepulsepressureinoppositedirections:
A.TrueB.False
Question#5
Asuddenriseincardiacoutputwouldelevatethemeanarterialpressureofapersonwithreducedarterialcapacitancemorerapidlythanitwouldinanormalperson.
A.TrueB.False
Question#6Thevenoussideofthecirculationischaracterizedby
A.lowpressureB.lowresistancetoflow.
C.largevolumecapacity.D.richsympatheticandparasympatheticinnervation
E.alloftheaboveexceptD.
Question#7Ingeneral,itcanbesaidthat:
A.thevolumecapacityoftheaortaishighbecauseofitsgreatdistensibility.
B.bloodvolumecapacityishighestattheveins,crosssectionalareaisgreatestatthecapillaries,andresistancetoflowisgreatestatthearterioles.
C.bloodvelocityissimilarinallpartsofthebed.
D.bloodpressuredropsfromaortatocapillaries,thenrisesatthelevelofthevenules.E.AlloftheaboveexceptA.
PreviousQuestionNextQuestion
Question#8Thearterialsideofthecirculationischaracterizedby
A.turbulentbloodflow.B.highpressure.C.highresistancetoflow.D.smallvolumecapacity.E.AlloftheaboveexceptA.
Question#9Thefollowingis/arecorrectregardingthestructureandcompositionofthevascularbed:
A.aorticcapacityishighestbecauseofthelargeconcentrationofelastin.
B.bloodvolumeisgreatestintheveins,crosssectionalareaisgreatestatthecapillaries,andresistancetoflowisgreatestatthearterioles.
C.bloodvelocitydecreasesinthesmallervessels.
D.bloodpressuredropsfromaortatocapillaries,thenrisesatthelevelofthevenules.E.B.andC.
Question#10Thepressurepulseintherootoftheaortais:
A.narrowerthantheperipheralpulse.
B.characterizedbyamorepronounceddicroticnotchthanwouldbefoundintheperipheralvessels.C.identicaltothepulseintheperiphery.
D.characterizedbyalowerfrequencythantheperipheralpulse.
Question#11Selectthesinglebestanswertothenumberedquestion.
Meanpressureisapproximatelyequalto:
A.systolicpressure-diastolicpressureB.systolicpressure+diastolicpressure
C.diastolicpressure+1/3systolicpressureD.1/3(systolicpressure-diastolicpressure)E.noneofthese
Answer:
1.C2.C3.A4.A5.A6.E7.B8.E9.E10.B11.E
Hemodynamics
Question#1Thetotalresistancethroughaparallelsetof3tubes,ofresistance5,10,and20units,respectivelyis:
A.0.35unitsB.2.9unitsC.3.5unitsD.35unitsE.29units
Question#2Ifyoumeasurethechangeinpressureinasubject'sscalpandinherankleduringthetimethatshestandsup:
A.thearterialpressureintheankle,wouldincreasemorethanthevenouspressure.
B.duetothecardiacaccelerationassociatedwithstanding,themeasuredpressureswouldriseinboththescalpandtheankle
C.thedrivingpressureacrossthelegandtheheadwouldincreasebythesameamount
D.theflowthroughthearterywouldincreasebymorethantheflowthroughtheveinbecausethebloodflowsdownhillintheartery.
E.noneofthese
Question#3Constrictionofvessel"C"wouldincreasethefiltrationoffluidfromvesselsB1throughB4.A.TrueB.False
Question#4Constrictionofvessel"A"wouldhavethesameeffectontotalflowthroughthisnetworkasconstrictionofvessel"C",butwouldhavetheoppositeeffectonfiltrationfromtheBvessels.
A.TrueB.False
Question#5Assummingthatallofthe"B"vesselsbelowareidentical,removalofoneofthemwouldbeexpectedto:
A.increasetheflowthroughthenetworkby33%
B.increasethenetworkresistanceby33%
C.lowerthefiltrationcoefficientofthenetwork
D.AandBE.BandC
Question#6
Whenlinearvelocityofflowinabloodvesselis100cm/secandthevolumeflowis200ml/sec,thecross-sectionalareais:
A.300cm2B.100cm2C.0.5cm2D.2.0cm2E.noneofthese
Question#7Selectthesinglebestanswertothenumberedquestion.
GivenlaminarflowofaNewtonianfluidthroughacylindricaltubewithafixeddrivingpressure,iftheradiusisdoubled,flowwill:
A.double.B.remainunchanged.C.quadrupleD.increase16-fold.E.increase8-fold.
Question#8Redbloodcellshavearelativelysmalleffectontheviscosityofbloodinarteriolesduetotheirbiconcavediscshape.A.TrueB.False
Question#9Thetotalforceexertedonthesemilunarvalvesbythepressureofthebloodwouldbedoubledifthediameterofthevalveweredoubled.A.TrueB.False
Question#10Thedrivingpressureforagivensegmentofthecirculationisthedifferencebetweentheinputpressureandoutputpressuretothesegment.
A.TrueB.False
Question#11Bloodisthickerthanwatermainlybecauseofthesemigelnatureoftheplasmaproteinsinthebody.A.TrueB.False
Question#12Thevelocityoftheredcellsisusuallyfasterthanthevelocityoftheplasmainthemicrovessels.A.TrueB.False
Question#13IfaNewtonianfluidisflowingthroughaconstrictioninacircularpipe,whichofthefollowingistrue?
A.thevelocityofthefluidincreasesasthefluidexitstheconstriction.
B.thepressuremeasuredbyacatheterinsertedintothelumenattheconstrictionwouldbelowerthanthepressuremeasuredattheentrancetotheconstriciton.
C.thevelocitythroughtheconstrictionwouldvarywiththe4thpoweroftheradiusofthetube.
D.thetotalenergyofthefluidwouldincreaseasthefluidacceleratesthroughtheconstriction.
Question#14Ifthecardiacoutputis6L/minandthearterialpressureis120mmHg,thenthecapillarypressuremustbetwomillimetersofmercury.
A.TrueB.False
Question#15Twovesselswithequalresistancesareconnectedinseries,andtheinflowandoutflowpressuresarefixed.Iftheresistancesofbothvesselsaredoubled,thepressureatapointmidwaybetweenthemwouldbedoubled.
A.TrueB.False
Question#16Whichofthefollowingaretrueaboutturbulence?
A.Itislesslikelytooccuratalowflowthanatahighflow.
B.Foragivenflow,turbulencewouldbemorelikelytooccurinalargevesselthaninasmallvessel.
C.Turbulenceismorelikelytooccurwithahighviscosityfluidthanwithalowviscosityfluid.
D.Turbulenceisnoiserthanlaminarflow.E.A,andD
Question#18Selectthesinglebestanswertothenumberedquestion.
Shearratecanaffecttheviscosityoftheblood.A.TrueB.False
Question#19Examinethedrawingbelow,andchoosethecorrectanswerregardingpressuresthatmightbemeasuredinthetube(assumethattherearenofrictionallossesalongthelengthofthetube).
A.P1
Question#20Examinethefigurebelowandanswerthequestionsregardingthepressures.
A.P2>P3B.P3>P2C.P2=P3D.can'tsay
Question#21Theshearstressinanarteryisgreaternexttothethewallthanatthecenterofthevessel.
A.TrueB.False
Answer:
1.B2.E3.A4.A5.E6.D7.D8.B9.B10.A11.B12.A13.B14.B15.B16.E17.A18.A19.A20.B21.A
TheMicrocirculation-Part1
Question#1Whichoneofthefollowingstatementsistrue:
A.Thehigherthemolecularweightofasubstancethemorereadilyitdiffusesacrossthecapillary.
B.Capillarysurfaceareadoesnotinfluencetheamountofsubstancewhichdiffusesdownaconcentrationgradient.
C.Foragivenmolecularsize,lipidinsolublesubstancesdiffusemorereadilythanlipidsolublesubstances.
D.Thetransportofsmallsolutesacrossthecapillarywallcannotbedescribedintermsofphysicallaws.E.Nonearetrue.
Question#2
Underphysiologicalconditionscapillaryexchangeiscontrolledprimarilyby:
A.alteredcapillarypermeability.B.alteredplasmaoncoticpressure.
C.alteredvascularsmoo
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