In a person with a sinus rhythm, the primary purpose of the AV node is to
1. pace the heart at 40–60 bpm.
2. delay the impulse from the SA node.
3. pace the heart at 60–100 bpm.
4. enhance the impulse from the SA node.
2
Rationale 1: The AV junction does pace the heart at 40–60 bpm, but not when the SA node is pacing the heart.
Rationale 2: The AV node delays the impulse as it travels from the atria to the ventricles.
Rationale 3: The AV junction does not pace the heart at 60–100 bpm.
Rationale 4: The AV node does not enhance the impulse as it travels from the atria to the ventricles.
Global Rationale: The AV node delays the impulse as it travels from the atria to the ventricles. The AV junction does pace the heart at 40–60 bpm, but not when the SA node is pacing the heart.
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