Phys 1 Cardiac Action Potentials Flashcards
What portion of the tissue receives action potential before the other?
which ventricle’s epicardium receives action potential first?
Conduction velocity
from high to low
explain why AV is the way it is?
What is the pacemaker of the heart?
what is the difference that causes this?
Phase 4 in the SA and AV nodes
which gates open/close?
What else is this phase called?
Rhythmicity
Phase 0
SA and AV nodes
what gates open/close?
What else is this called?
Action potential
Cardiac action potentials
SA and AV nodes
what phases are missing?
why?
Phase 3 SA and AV nodes
what gates open/close?
what else can it be called?
Reporlarization
SA node vs AV node
what happens downstream?
Phase 4 in fast tissues/fibers
also called what?
what gates are opened/closed?
Phase 0 in fast tissues/fibers
also called what?
what gates are opened/closed?
Phase 1 in fast tissues/fibers
also called what?
what gates are opened/closed?
Phase 2 in fast tissues/fibers
also called what?
what gates are opened/closed?
Phase 3 in fast tissues/fibers
also called what?
what gates are opened/closed?
conduction velocity
what determines it?
Defective conduction velocity
AV damage?
Purkinje fiber damage?
Refractory periods
ARP
RRP
SNP
General refractory periods
What happens if conduction of action potential happens during RRP?
Autonomic effects on action potentials
the 4 terms about speed rate strength and relaxiation?
Autonomic effects on action potentials
Parasympathetics
what nerve?
to where?
Neurotransmitter?
receptor?
Autonomic effects on action potentials
Parasympathetics
Chronotropic effects
Dromotropic effects
special K (b) channels will cause the hyperpolarization (it is Ach sensitive)
Autonomic effects on ACtion potentials
Sympathetics
To what nodes?
Neurotransmitter?
Receptor?
Autonomic effects on action potentials
Sympathetics
Chronotropic effects?
Dromotropic effects?
also what effects?
Difference in action potential graphs for sympathetic and parasympathetic stimulation?
Drugs what types do what?
are the resting membrane potential the same for ventricle atrium and SA node?
what is voltage gated K channel?
will usually open during phase 3 to help repolarization
