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In the electrical conduction system of the heart, the sinoatrial node is located in the right atrium near the superior vena cava. It serves as the normal pacemaker of the heart. There is another node, which is located in the right atrium on the septal wall. This node slows the impulses of the heart so that the atria can fill with blood before it contracts. What is the name of this node?
  1. Sinoatrial Node
  2. Bundle of His
  3. Purkinje Fibers
  4. Atrioventricular Node
Explanation
Answer: D - The atrioventricular node is located in the right atrium on the septal wall. This node slows the impulses of the heart so that the atria can fill with blood before it contracts. The bundle of his is a group of muscle fibers in the center of the heart on the septum. The bundle of his receives electrical impulses that branch off to the right and left. The Purkinje fibers lie across the surface of the ventricles and give the final signal for the ventricles to contract.
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