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If the SA node failed, the AV node would drive the heart at about:

A40 to 60
B10 to 30
C70 to 90
D20 to 40
Answer & Solution
Correct answer: A. 40 to 60
1. Backup pacemakers are slower. 2. The AV node is the first backup. 3. Its rate is about 40 to 60. _Source: OpenStax Anatomy and Physiology 2e, Chapter 19, The Cardiovascular System: The Heart._
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