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Anatomy & Physiology

Automaticity Ability of pacemaker cells to INITIATE an electric stimulus spontaneously WITHOUT external stimulus
Excitability is the ability of cardiac muscle cells to ___ to an ___ electric stimulus Respond; outside
Conductivity is the ability of cardiac cells to ___ an electric impulse and propagate the impulse to __ Receive; next cell
Contractility is the ability of cardiac cells to shorten ___ In respond to electric stimulus
In diastole the __ of the cell is electrically more ___ than __ of the cell Inside; negative; outside
In resting state, there are more __ ions than __ inside the cell K+, Na+
Depolarization is the ___ of the cell membrane Electrical excitation
Repolarization is the ___ of cell membrane to its ___ ___ Return; resting states
In repolarization, the channels for __ open and it flows out, taking the __ charge with it K+, positive
At end of ___, the Na-K pumps in cell membrane move potassium in and sodium out of cells Repolarization
___ is the primary pacemaker of the heart SA node
SA Node cells depolarize automatically at rate of ___ 60-100
AV Node can function as the ___ of the heart Backup pacemaker
AV Node automatically depolarize at rate of ___ 40-60
AV Node ___ the conduction of the impulse from atria to ventricles from dangerously fast rate Slows
Bundle of HIS is Short bundle of fibers at bottom of AV node leading to BBs
Bundle Branches Carry impulse into R and L ventricles.
Purkinje fibers act as the ___ pacemaker, automatically depolarizing at rate of Final backup; 20-40
P wave represnts Atrial depolarization as impulse travels through atria
PR interval represents Atrial depolarization + AV conduction time
Normal PR interval is 0.12-0.20
QRS represents Ventricular depolarization and intraventricular conduction time
Q wave represents 1st negative deflection from baseline
R wave represents 1st POSITIVE deflection from baseline (ALWAYS upright)
S wave represents Negative deflection following R
Normal width of QRS 0.06-0.10
T wave repesents Ventricular repolarization
Created by: choel