A branch of the _______ supplies the right atrium and right ventricle with blood Correct Answer: right
coronary artery (RCA)
Stimulation of parasympathetic nerve fibers typically results in what action? Correct Answer:
...
A branch of the _______ supplies the right atrium and right ventricle with blood Correct Answer: right
coronary artery (RCA)
Stimulation of parasympathetic nerve fibers typically results in what action? Correct Answer: Slowed
conduction through the atrioventricular (AV) node
The contribution of blood that is added to the ventricles and results from atrial contraction is called:
Correct Answer: atrial kick
Semilunar Valves include: Correct Answer: pulmonary valve and aortic valve
The left main coronary artery divides into the Correct Answer: LAD and Cx branches
_____ cells are specialized cells of the electrical conduction system responsible for the spontaneous
generation and conduction of electrical impulses. Correct Answer: Pacemaker
The absolute refractory period beings with.... Correct Answer: begins with the onset of the QRS complex
and terminates at approximately the apex of the T wave
T/F: The QT interval represents the time from initial depolarization of the ventricles to the end of
ventricular repolarization Correct Answer: true
How do you determine whether the atrial rhythm on an ECG tracing is regular or irregular? Correct
Answer: compare P-P intervals
Which ECG leads use two distinct electrodes, one of which is positive and the other negative? Correct
Answer: leads I, II, and III
In sinus arrhythmia, a gradual decreasing of the heart rate is usually associated with? Correct Answer:
expiration
An ECG rhythm strip shows a ventricular rate of 46 bpm, a regular rhythm, a PR interval of 0.14 second,
a QRS duration of 0.06 second, and one upright P wave before each QRS. This rhythm is: Correct
Answer: sinus bradycardia
SA block is a disorder of ______, and sinus arrest is a disorder of impulse _______. Correct Answer: SA
block is a disorder of conduction
Sinus arrest is a disorder of formation
Signs and symptoms experienced during a tachydysrhythmia are usually primarily related to: Correct
Answer: decreased ventricular filling time and stroke volume
Example that reflects ectopic (latent) pacemaker: Correct Answer: the AV junction and ventricles
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