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Category - NSCA

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Which part of the heart controls the rhythm of the heart’s electrical stimulations, and thus its pumping action?
  1. Atrioventricular node
  2. Sinoatrial node
  3. Purkinje fibers
  4. Atrioventricular bundle
Explanation
Answer: B - The sinoatrial node controls the rhythm of the heart’s electrical stimulations, and thus its pumping action. This is accomplished by cooperation between the sympathetic and parasympathetic nervous systems, which control the rate of discharge of the electrical impulses.
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