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Cardiac Action Potential: Marked Regional Differences
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Cardiac Action Potential: Marked Regional Differences

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Questions and Answers

Which region of the heart lacks a clear plateau phase in its action potential?

  • Purkinje fibers
  • AV node
  • SA node (correct)
  • Ventricular myocytes

    • Which type of cells exhibit automaticity in their action potential?

  • Ventricular endocardium
  • Purkinje fibers
  • SA node (correct)
  • AV node

    • Which region of the heart has a slow Ca-mediated upstroke in its action potential?

  • SA and AV nodes (correct)
  • SA node
  • Ventricular myocytes
  • Purkinje fibers

    • What distinguishes the shape of the cardiac action potential when recorded from different regions of the heart?

    <p>Varying densities of ion channels</p> Signup and view all the answers

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