Q:

Which of the following would produce a DECREASE in heart rate?

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Which of the following would produce a DECREASE in heart rate?


  1. sympathetic impulses along the cardioaccelerator nerves.
  2. increased sympathetic impulses along the vasomotor nerves
  3. decreased sympathetic impulses along the vasomotor nerves.
  4. parasympathetic impulses along the vagus nerve.

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D: Parasympathetic stimulation (which almost always utilises the vagus nerve) causes a decrease in heart rate.

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