Certified Clinical Medical Assistant Exam Practice Question
In the conduction system of the heart, which of the following components is stimulated after the sinoatrial node?
Correct Answer: D
Rationale: The sinoatrial (SA) node initiates the electrical impulse that regulates heartbeats. Following this, the impulse travels to the atrioventricular (AV) node, which acts as a gatekeeper, delaying the signal before it moves to the ventricles.
Option A (Left bundle branch) and Option C (Right bundle branch) are incorrect as they are activated after the AV node during the conduction pathway. Option B (Purkinje fibers) is also wrong since they receive impulses after both the AV node and the bundle branches. Thus, the AV node is the immediate component stimulated after the SA node, ensuring proper timing for ventricular contraction.
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