Cardiac Muscle Tetanus and Contractions Quiz
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Questions and Answers

Can cardiac muscle undergo tetanus?

  • Yes, but only under certain experimental conditions
  • No, it cannot undergo tetanus due to differences in muscle physiology (correct)
  • No, but it can exhibit sustained contraction under certain conditions
  • Yes, it can undergo tetanus just like skeletal muscle

    • What is the primary reason why cardiac muscle cannot undergo tetanus?

  • Lack of myosin and actin filaments
  • Lower energy production by mitochondria
  • Presence of a longer refractory period (correct)
  • Higher resistance to calcium ions

    • In what way does cardiac muscle differ from skeletal muscle regarding tetanus?

  • Skeletal muscle has a longer action potential duration
  • Cardiac muscle contracts more rapidly
  • Cardiac muscle has a higher myoglobin content
  • Skeletal muscle has a shorter refractory period (correct)

    • Under what circumstances can cardiac muscle exhibit sustained contraction?

    <p>In response to electrical stimulation (D)</p> Signup and view all the answers

    Can cardiac muscle exhibit sustained contraction due to tetanus?

    <p>No, it lacks the ability to generate tetanic contractions (A)</p> Signup and view all the answers

    What is the primary reason for the inability of cardiac muscle to undergo tetanus?

    <p>Inherent refractory period of cardiac muscle cells (D)</p> Signup and view all the answers

    How does cardiac muscle differ from skeletal muscle regarding tetanus?

    <p>Cardiac muscle lacks the ability to generate tetanic contractions unlike skeletal muscle (C)</p> Signup and view all the answers

    Under what circumstances can cardiac muscle exhibit continuous contraction?

    <p>During pathological conditions such as heart failure (A)</p> Signup and view all the answers

    Why is it not possible for cardiac muscle to undergo tetanus?

    <p>Cardiac muscle has a longer refractory period compared to skeletal muscle. (B)</p> Signup and view all the answers

    What is the primary reason for the inability of cardiac muscle to exhibit sustained contraction due to tetanus?

    <p>Cardiac muscle has a lower myosin-ATPase activity compared to skeletal muscle. (A)</p> Signup and view all the answers

    What distinguishes cardiac muscle from skeletal muscle regarding its susceptibility to tetanus?

    <p>Cardiac muscle exhibits spontaneous depolarization, preventing the occurrence of tetanus. (C)</p> Signup and view all the answers

    Under what circumstances can cardiac muscle exhibit continuous contraction?

    <p>During sympathetic stimulation leading to an increase in calcium influx. (D)</p> Signup and view all the answers

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