Velocity of Signal Conduction in Cardiac Muscle
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Questions and Answers

What is the velocity of signal conduction in cardiac muscle fibers?

  • 5 to 6 m/sec
  • 10 to 12 m/sec
  • 1 to 2 m/sec
  • 0.3 to 0.5 m/sec (correct)

    • How does the velocity of signal conduction in cardiac muscle fibers compare to that in very large nerve fibers?

  • Approximately 1/100
  • Approximately 1/10
  • Approximately 1/50
  • Approximately 1/250 (correct)

    • What is the velocity of conduction in the specialized heart conduction system (Purkinje fibers)?

  • 6 m/sec
  • 4 m/sec (correct)
  • 8 m/sec
  • 10 m/sec

    • What characterizes the refractory period of cardiac muscle?

    <p>It is the interval of time during which restimulation cannot occur.</p> Signup and view all the answers

    What is the normal refractory period of the ventricle in cardiac muscle?

    <p>0.25 to 0.30 second</p> Signup and view all the answers

    What is the main function of excitation-contraction coupling in muscle cells?

    <p>To cause the muscle fibers to contract</p> Signup and view all the answers

    How does the refractory period of atrial muscle compare to that of ventricles?

    <p>Shorter in atrial muscle</p> Signup and view all the answers

    What is the role of calcium ions in the excitation-contraction coupling of cardiac muscle?

    <p>Promote sliding of actin and myosin filaments</p> Signup and view all the answers

    How does the action potential spread within a cardiac muscle fiber?

    <p>Through membranes of transverse (T) tubules</p> Signup and view all the answers

    Which structure releases calcium ions into the muscle sarcoplasm in cardiac muscle cells?

    <p>Sarcoplasmic reticulum</p> Signup and view all the answers

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