Chapter4CardiovascularsystemSection 1 Pumpingfunction of theheartSection 2 Electrophysiological propertySection3 VascularsystemSection4 Regulation ofthe heart
Chapter 4 Cardiovascular system Section 2 Electrophysiological property Section 1 Pumping function of the heart Section 3 Vascular system Section 4 Regulation of the heart
The heart is the pump that propels the bloodthrough the systemic and pulmonary circuits.CORRELATIONOFEVENTSINLEFTSIDEOFHEARTELECTROCARDIOGRAMPRESSUREmmfO21Len AtrialPressure10UENTRICULAR BOLUMEMDSD=Ventriculardiastole S-VentnicularsystoleElectrophysiologicalProperties
Electrophysiological Properties The heart is the pump that propels the blood through the systemic and pulmonary circuits
Electrophysiological Properties of the heartExcitabilityCORRELATIONOFEVENTSINLEFTSIDEOFHEARTELECTROCRRDIOGRAMConductivityPRESSURE mmHg20Left Atrial80Pressure0ContractilityUENTRICULARUOLUME12AutorhythmicityDSD-Ventricular diastole S-Ventricularsystole
Electrophysiological Properties of the heart Autorhythmicity Excitability Conductivity Contractility
Cardiac CellsSANContractile cells:AMnAVN-AtrialmuscleBH-Ventricular musclePFTPFAutorhythmic cells:VMSpecialized excitatory and300600msconductive muscleTransmembrane potentials-SAnoderecorded in different heart- Purkinje fiberregions
Cardiac Cells Contractile cells: • – Atrial muscle • – Ventricular muscle Transmembrane potentials recorded in different heart regions. Autorhythmic cells： Specialized excitatory and conductive muscle – SA node – Purkinje fiber
Transmembrane potential of ventricular cellsAW)2020AW2020404000-60-608080AutorhythmiccellContractilecellTime (ms)Time(ms)+++++++十+十++
Transmembrane potential of ventricular cells