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Question	Answer
2 specialized types of cardiac muscle cells	contractile myocardial cells and non contractile autorhythmic cells
__cells responsible for the mechanical pumping of the heart	contractile myocardial cells
99% for cardiac muscle tissue are ___ cells	contractile myocardial cells
___ cells of the conduction system are responsible for electrical stimulation of myocardial cells	non contractile autorhythmic cells
__cells are 1% of cardiac muscle tissue	non contractile autorhythmic cells
__cells spontaneously depolarize via slow movement of + ions through channels leading to threshold then generating an AP	autorhythmic cells
AP travels throught the conduction system triggering the contraction of	the surrounding myocardial tissue
different parts of the hearts conduction system have their own _ rate	autorhythmicity rate
4 Components of the conduction system	SA node, AV node, AV Bundle, and Purkinje fibers
autorhythmicity rate of 70 beats/min	SA node
autorhythmicity rate of 50 beats/min	AV node
autorhythmicity rate of 35 beats/min	AV bundle
autorhythmicity rate of 30 beats/mini	Purkinje fibers
a recording of the electrical changes that accompany the cardiac cycle	electrocardiogram (ECG)
represents the depolarization of the atria as a wave of negativity spreads from the SA node toward the ventricles	P wave
represents the spread of excitation throught the ventricular myocardium resulting in depolarization of ventricular muscle	QRS complex
atrial repolarization is masked by	the large QRS deflection
represents the repolarization of the ventricles	T wave
represents the interval between the activation of the SA node and the AV node	P-R interval
represents the interval between atrial depolarization and ventricular depolarization	P-R segment
represents the interval between the end of the S wabe and the start of the T wave, ventricles are uniformly excited	S-T segment
represents the interval of time between successive cycles	R-R interval
flattened T wave=	heart muscle is ischemic
enlarged ST segment=	acute myocardial infarctions
enlarged R=	enlarged ventricles