《血液循环2生理学》PPT课件

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1、ChapterIVbloodcirculation生理学PHYSIOLOGY内容简介：心脏的生物电活动心脏生理(CardiacPhysiology)心脏的泵血功能血管生理（vascularphysiology)心血管活动的调节SectionTwoMechanismofheartpumpSectionOverviewCardiaccircle;Processofheartpumpingblood;Estimationoffunctionofheartpumping;Cardiacreserve;Regulationofheartpumping;

2、Heartrate,(HR)Thetimesofheartbeatinaminute.Normalvalue:60~100beats/minHR>100b/m---TachycardiaHR<60b/m---BradycardiaCardiaccircleDefinition:心脏一次收缩和舒张所构成的机械活动周期。Consistingofcontractionorsystole,relaxationordiastole.Thereisasequenceofsystoleanddiastoleoftheatriumandventricle.心

3、房收缩是一次心动周期的开始。ContractionofventricleContractionofatriumWholeheartdiastolerelaxationofventriclecardiaccycleFirst,atriacontraction(0.1s)→then,ventriclescontraction(0.3s)→last,alltheheartrelaxation(0.4s);Atriacontractionandventriclescontractionarenotoccursimultaneously;Diastol

4、eislongerthansystoleforboththeatriumandventricle.Cardiaccycle=60/HRHR↑，cardiaccycle↓；diastole↓moreapparently；TheprocessofheartpumpingVentricularsystole:isovolumiccontractionphase（1）ejectionphase:rapidejectionphase（2）reduceejectionphase（3）Ventriclesdiastole:isovolumicrelaxat

5、ion（4）fillingphase:rapidfillingphase（5）reducedfillingphase（6）atrialsystole（7）TricuspidValveAorticsemilunarValvePulmonarysemilunarValveMitralValveVentricularSystoleDuration:0.05sPressure:aorta>ventricles>atriaValve:A-Vclosed,SemilunarclosedV-ventricles:notchangeBloodcurrentd

6、irection:notflowCharacteristics:ventricularpressurerisesdrasticallyIsovolumetricventricularcontractionRapidVentricularEjectionDuration:0.1sPressure:ventricles>aortaValve:A-Vclosed,SemilunaropenedV-ventricles:decreaseBloodcurrentdirection:bloodejectedintoaortarapidlyCharacte

7、ristics:P-ventriclesreachpeakEjectingvolumeis2/3ofthetotalejectingVentricularSystoleReducedVentricularEjectionDuration:0.15sPressure:ventricles

8、reliesonthemomentum（动量）ofbloodVentricularSystoleVentricularDiastoleDuration:0.06~0