_____ is the ability of cardiac pacemaker cells to spontaneously initiate an electrical impulse ...

The answer to question 1  C
The ability of cardiac pacemaker cells to create an electrical impulse without being stimulated from another source is called automaticity.

The answer to question 2  T
An abnormal (i.e., pathologic) Q wave is more than 0.04 seconds in duration or more than one third the height of the following R wave in that lead. Myocardial infarction is one possible cause of abnormal Q waves. In the early hours of infarction, an abnormal Q wave may not have developed to its full width or amplitude. Therefore a single ECG tracing might not identify an abnormal Q wave. In a patient with a suspected myocardial infarction, be sure to look at Q waves closely. Even if the initial ECG tracings do not show Q waves that are more than 0.04 seconds in duration or equal to or more than one third of the amplitude of the QRS complex, pathology must be considered if the Q waves become wider or deeper in each subsequent tracing.

The answer to question 3  A
The right coronary artery supplies the right atrium and ventricle with blood.

The answer to question 4  T

The answer to question 5  F
An idioventricular rhythm (IVR), which is also called a ventricular escape rhythm, exists when three or more ventricular escape beats occur in a row at a rate of 20 to 40 beats/min (i.e., the intrinsic firing rate of the Purkinje fibers).

The answer to question 6  T

The answer to question 7  F
Cardiopulmonary resuscitation and defibrillation are the treatments of choice for pulseless ventricular tachycardia or ventricular fibrillation.