What structure serves as the backup pacemaker for the heart?
A) atrioventricular (AV) node
B) sinoatrial node
C) bundle of His
D) Purkinje fibers
Correct Answer:
Verified
Q2: Valvular defects in the heart can be
Q3: What parameter is measured on the vertical
Q4: The electrocardiogram (ECG) is primarily used to
Q5: What is implied by an abnormally prolonged
Q6: Which of the following axis placements represents
Q7: What is the normal period of time
Q9: Why is the electrical impulse temporarily delayed
Q10: What structure normally paces the healthy heart?
A)atrioventricular
Q16: The QRS of an ECG falls on
Q17: Which of the following waves represents depolarization
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