cardiac conductive physiology Flashcards
What is the rate of the SA node?
60-100, starts the impulse here
Which artery supplies the SA note?
Right Coronary
What is the cardiac conduction velocity? of the tissue
Purkinje fibers> atrial myocytes > ventricular myocytes > AV node
What is the rate of the AV node?
45-55
What are the two types of cells in the heart?
pacemaker cells and non pacemaker cells
What are the pacemakers cells?
SA node/ AV node
Why is there no resting potential in the pacemaker cell
because of the Na influx current
Which ions are responsible for depolarization in terms of pacemaker potential?
1) permeability of the Na current (slow)
2) permeability of T type (transient) and L type Ca, make it more depolarized
What drives the action potential depolarization in the pacemaker?
Calcium (L type)
Pacemaker action potential refers to what heart rate or contractility?
heart rate
Non pacemaker cell refers to HR or contractility?
contractility
Which cells of the heart do not present with automaticity?
non pacemaker cells
do not exihibit automacity, Phases 0-4 present, resting potential phase present- which cells
non pacemaker action potential
Which ion is responsible for action potential depolarization (non pacemaker)
Fast Na
What is responsible for plateau non pacemaker action potential?
Ca (in) and K (efflux)
