Fichas
Circulation III
Fichas del conjunto (24)
- 1Cardiac outputCO=HR*Stroke Vol.
L/min = Bpm * L - 2HR stimANS (Para)sympathetic stim.
Circulating hormones - 3Stroke vol. stimextrinsic:
Sympathetic stim.
Intrinsic:
Degree of cardiac muscle stretch
like endothelium derived NO
or metabolites + relating factors e.g. H+/CO2/Hypoxia - 4Cardiac PacemakerSANs generates electrical activity
- 5Atrium/Ventricle/SANs depolarisationa eh ahee
- 6E activity pathwaySAN -> RA -> LA -> AVN (Delay) -> Bundle of His -> Septum of heart -> L/R V
- 7Lead II positionBundle of His axis
- 8ECG readingPQRST
- 9P waveAtria depolarisation
- 10PR intervalConduction through AV node
- 11QRS complexDepolarisation of ventricles
More cells = larger depolarisation
Repolarisation of atria distorted by large depol - 12T waveRepolarisation of ventricles
- 13QT durationVentricular repo+depo
- 14The heart is a functional what now, sonny boy? I say young whippersnapper, the heart is a functional what now?Functional syncytium gramps!
Each individual cell cooperates with one another to create a co-ordinated wave of excitation/contraction! - 15Well I'll be! Crazy how advanced science is these days. Now say now sonny boy, just how do they do that?Well gramps it's simple, the cells are electrically coupled through gap junctions
They're also mechanically coupled - 16Why is relaxation co-ordinated w/ excitation?To allow sufficient time for filling
- 17What do valves ensure?One-way flow of blood
- 18SystoleContraction of chamber and ejection of blood
- 19DiastoleRelaxation and filling
- 20Events of cardiac cycle1. Atrial systole (ventricular diastole).
2. Isovolumetric contraction of ventricles
3. Ventricular systole.
4. Isovolumetric relaxation of ventricles
5. Passive refilling of ventricles - 21Diagram of valve opening shuttingMitral valve closes
Aortic valve opens
Aortic valve closes
Aortic pressure
Left atrial pressure
Mitral valve opens - 22Dynamic Pressure-Volume relationship in left ventricleA-~>B Diastole filling
B~>C Isovolumic contraction
C~> D Ejection of blood
D~>A Isolvolumic relaxation - 23PS Stim on SAN pacemaker activityStim vagus nerve, slows rate of depol.
Slows heart rate - 24S stimDelop reaches threshold much more rapidly
^ heart rate
Información
- Descripción
- El usuario ha eliminado su información de asignaturas Fichas sobre Circulation III, creado por Usuario eliminado el 24/04/2018.
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- Creado por J yadonknow · 14 abr 2018
- Copiado por J yadonknow · 24 abr 2018
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