Coronary Care 2 electrical conduction Flashcards
4 specialized properties of myocardial cells are
automaticity
excitability
conductivity
contractility
SA node is located in
the RA wall
SA node normally initiate pulses at a rate of
60-100 rpm
activation/depolarization of atrial musculature is responsible for the
P wave
internodal tracts travel through the
RA along the ___ , through the LA along ____
RA along the internodal pathway
LA along the Bachmann’s Bundle
Internodal tracts plays an important role in __ conduction
intra-atrial
Internodal tracts influence __ from the SA node to the AV node
conduction time
AV node and AV junction allow impulse to transmit from ___ to ___
from atria to the ventricles
one of the most important properties of the AV node is
low conduction velocity
low conduction velocity in the AV node and AV junction are responsible for the ____
PR interval
AV junction can generate ___ impulses per minute
40-60
Impulses travel down tot the ventricles through____
Bundle of HIS
from the Bundle of HIS, impulses travel to
both Bundle Branches: Left and right
Bundle of HIS can initiate impulses at a rate of
20-40 rpm
R bundle branch lies
supplies
anteriorly, closer to the RV
supplies the septum and the RV
L bundle branch divides into 2 fascicles
anterior superior fascicle
posterior inferior fascicle
the anterior superior fascicles supplies
the septum
the anterior wall of the LV
the lateral wall of the LV
the posterior inferior fascicle supplies
the septum
the posterior wall of the LV
the lateral wall of the LV
impulses travels down from bundle branches to ___
Purkinje fibers
the HIS-Purkinje network is characterized by ______- conduction velocity
rapid
activation/depolarization of the ventricular muscle generates the
QRS complex
spread of ventricular depolarization begins from the _____ travels ______
from inside to outward
endocardium to epicardium
