SA Node Discharge
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Questions and Answers

What is the primary factor affecting heart rate?

  • Parasympathetic activity
  • Autonomic nerves activity (correct)
  • Decreased level of c-AMP
  • Acetylcholine muscarinic receptors

    • Which of the following decreases the slope of phase 4 in the SA node?

  • Decreased level of c-AMP
  • Activation of KAch (correct)
  • Increased level of c-AMP
  • Increased conductance

    • What effect does Bradycardia have on heart rate?

  • Has no effect on heart rate
  • Can either increase or decrease heart rate depending on the cause
  • Increases heart rate
  • Decreases heart rate (correct)

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