SA Node Modulation Quiz
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Questions and Answers

What effect does sympathetic activity have on the SA node discharge rate?

  • Has no effect on the rate of SA node discharge
  • Decreases the rate of SA node discharge via Beta 2 receptors
  • Causes irregular SA node discharge
  • Increases the rate of SA node discharge via Beta 1 receptors (correct)

    • How does parasympathetic stimulation affect the heart rate?

  • Speeds up the heart rate by blocking Na+ channels
  • Has no effect on the heart rate
  • Causes irregular heart rate patterns
  • Slows the heart rate by opening K+ channels (correct)

    • What is the primary mechanism through which sympathetic activity increases the force of cardiac contractility?

  • Increase in cAMP production via Beta 2 receptors (correct)
  • Activation of K+ channels
  • Inhibition of Na+ channels
  • Decrease in cAMP production via Beta 1 receptors

    • Which receptor is primarily involved in increasing the rate of SA node discharge due to sympathetic activity?

    <p>Beta 1 receptor</p> Signup and view all the answers

    How does sympathetic activity affect the delay at the AV node?

    <p>Decreases delay at AV node</p> Signup and view all the answers

    What is the primary effect of parasympathetic stimulation on cardiac pacemaker cells?

    <p>Opens K+ channels to slow the heart rate</p> Signup and view all the answers

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