JBL EMT Practice Exam

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When an electrical impulse reaches the AV node, it is slowed for a brief period of time so that:

  1. blood can pass from the atria to the ventricles.

  2. blood returning from the body can fill the atria.

  3. the impulse can spread through the Purkinje fibers.

  4. the SA node can reset and generate another impulse.

The correct answer is: blood can pass from the atria to the ventricles.

When an electrical impulse reaches the AV node, it is slowed for a brief period of time so that blood can pass from the atria to the ventricles. This delay allows the atria to contract and empty blood into the ventricles before they contract, ensuring proper coordination of the heart's pumping action. The other options are incorrect because they do not accurately describe the purpose of the delay at the AV node.

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