Practice Quiz

NREMT Advanced EMT

Category - Cardiology

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The primary pacemaker of the heart is the sinoatrial node. What is the intrinsic discharge rate per minute?
  1. 40 to 100 beats
  2. 60 to 100 beats
  3. 60 to 120 beats
  4. 80 to 100 beats
Explanation
Answer - B - The primary pacemaker of the heart is the sinoatrial node, which has an intrinsic discharge rate of 60 to 100 beats per minute. The intra-arterial pathways only distribute the discharge wave for uniform atrial contraction. The AV node is the secondary pacemaker, with a discharge rate of 40 to 60 beats per minute. The bundle of his transmits the impulse from the AV nod to the bundle branches.
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