Cardiac Muscle
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Questions and Answers

Which type of muscle is the cardiac muscle?

  • Involuntary (correct)
  • Smooth
  • Skeletal
  • Voluntary

    • What is the duration of cardiac action potentials?

  • 10 to 50 msec
  • 50 to 100 msec
  • 5 to 10 msec
  • 150 to 300 msec (correct)

    • What is the role of the L-type calcium channel in cardiac muscle cells?

  • Triggering the release of Ca2+ from the SR (correct)
  • Initiating a contraction
  • Propagating depolarization
  • Generating action potentials

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