10 Questions
Which of the following is NOT a potential consequence of abnormally automatic cardiac fibers in the ventricles?
Atrial fibrillation (AF)
Which of the following is a common form of supraventricular tachycardia?
Atrioventricular nodal reentrant tachycardia
Which of the following conditions must be present for the occurrence of abnormal impulse conduction through reentry?
At least one pathway for electrical impulse travel
What contributes to prolonged refractoriness and slowed impulse conduction velocity in cardiac tissues?
Myocardial ischemia
What may result if the rate of spontaneous impulse generation of abnormally automatic tissue exceeds that of the SA node?
Automatic tachycardia
What serves as the pacemaker of the heart under normal circumstances?
SA node
In case the SA node fails to generate depolarizations at a rate faster than that of the AV node, which structure may take over as the pacemaker?
AV node
What may result from abnormal increased automaticity of the SA node?
Sinus tachycardia
If both the SA node and AV node fail to generate depolarizations at a rate greater than 30-40/min, what may take over as the pacemaker?
Ventricular tissue
What occurs as a result of electrical depolarization of the atria and ventricles?
Atrial and ventricular contraction
Test your knowledge of the normal and abnormal cardiac conduction and electrophysiology, including the mechanical activity of the heart. Understand the role of the SA node as the pacemaker of the heart and its generation of electrical impulses.
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