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Physiology Test Question
Cells of the sinoatrial node are the primary pacemakers of the heart. In the absence of any input from the autonomic nervous system, how many action potentials do these cells generate every minute?
30 action potentials per minute
70 action potentials per minute
100 action potentials per minute
All of the above are possible
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Posted: Monday, December 29, 2014
Last updated: Monday, December 29, 2014