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Cardiac Muscle Function
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Cardiac Muscle Function

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Questions and Answers

What is the effect of parasympathetic stimulation on AV conduction velocity?

  • Decrease in conduction velocity (correct)
  • Complete block of conduction
  • Increase in conduction velocity
  • No effect on conduction velocity

    • What is the effect of parasympathetic stimulation on heart rate?

  • Increase in heart rate
  • Initial increase followed by decrease in heart rate
  • No effect on heart rate
  • Decrease in heart rate (correct)

    • What is the effect of parasympathetic stimulation on atrial contractility?

  • Increase in atrial contractility
  • Initial increase followed by decrease in atrial contractility
  • No effect on atrial contractility
  • Decrease in atrial contractility (correct)

    • What is the effect of parasympathetic stimulation on cardiac excitability?

    <p>Decrease in cardiac excitability</p> Signup and view all the answers

    What is the effect of parasympathetic stimulation on ventricular contraction and relaxation?

    <p>No effect on ventricular contraction and relaxation</p> Signup and view all the answers

    What is the negative dromotropic effect of parasympathetic stimulation?

    <p>Decrease in AV conduction velocity</p> Signup and view all the answers

    What is the effect of muscarinic cholinergic receptor stimulation on K+ channels?

    <p>Opening of K+ channels</p> Signup and view all the answers

    What is the effect of K+ channel opening on the SA node cell?

    <p>Decrease in spontaneous diastolic depolarization</p> Signup and view all the answers

    What is the normal range of AV conduction time?

    <p>0.12-0.20 s</p> Signup and view all the answers

    What is the effect of parasympathetic stimulation on the funny current and T-type Ca2+ channels?

    <p>No effect on funny current and T-type Ca2+ channels</p> Signup and view all the answers

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