Q:

What will cause the sinoatrial (SA) node to depolarize more frequently?

waelhammad
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2022-10-18
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What will cause the sinoatrial (SA) node to depolarize more frequently?

  1. Acetylcholine
  2. Norepinephrine
  3. Parasympathetic stimulation
  4. Vagus nerve
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waelhammad
2022-10-18
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B: Norepinephrine (released by the sympathetic nervous system) acting on the SA node increases heart rate and blood pressure. Parasympathetic stimulation along the vagus nerve decreases heart activity.

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