Cardiac Muscle Structure and Function Quiz
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Cardiac Muscle Structure and Function Quiz

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Questions and Answers

What is the primary energy source for cardiac muscle?

  • Anaerobic respiration
  • Glycolysis
  • Fermentation
  • Aerobic respiration (correct)

    • How does the structural properties of cardiomyocytes differ from skeletal muscle cells?

  • Cardiomyocytes are multinucleated
  • Cardiomyocytes lack striations
  • Skeletal muscle cells have a single nucleus
  • Skeletal muscle cells have intercalated discs (correct)

    • Which component of the heart is responsible for the conduction of electrical signals?

  • T-tubules
  • Purkinje fibers (correct)
  • Myofibrils
  • Sarcoplasmic reticulum

    • What structural property of cardiomyocytes contributes to the unique function of cardiac muscle?

    <p>High mitochondria density</p> Signup and view all the answers

    How do the structural properties of cardiomyocytes differ from skeletal muscle cells?

    <p>Cardiomyocytes lack T-tubules</p> Signup and view all the answers

    Which component of the cardiac conduction system is responsible for initiating the electrical signals in the heart?

    <p>Sinoatrial node (SA node)</p> Signup and view all the answers

    What is the primary difference between the structural properties of cardiomyocytes and skeletal muscle cells?

    <p>Presence of intercalated discs in cardiomyocytes but not in skeletal muscle cells</p> Signup and view all the answers

    How does the nearly exclusive reliance on aerobic respiration in cardiac muscle relate to its unique function?

    <p>It enables sustained, rhythmic contractions necessary for pumping blood throughout the body</p> Signup and view all the answers

    Through which pathway do electrical signals travel in the heart's conduction system?

    <p>SA node → AV node → Bundle of His → Purkinje fibers</p> Signup and view all the answers

    What is the primary reason for the nearly exclusive reliance on aerobic respiration in cardiac muscle?

    <p>Higher efficiency in producing ATP</p> Signup and view all the answers

    How do the structural properties of cardiomyocytes contribute to the unique function of cardiac muscle?

    <p>Ability to withstand high mechanical stress and pressure</p> Signup and view all the answers

    Which component of the cardiac conduction system is responsible for coordinating the contraction of the ventricles?

    <p>Purkinje fibers</p> Signup and view all the answers

    What structural property of cardiomyocytes allows for their unique function in the heart?

    <p>Presence of intercalated discs</p> Signup and view all the answers

    Which of the following is a key component of the cardiac conduction system responsible for coordinating the contraction of the atria?

    <p>Sinoatrial (SA) node</p> Signup and view all the answers

    How does the nearly exclusive reliance on aerobic respiration in cardiac muscle relate to its unique function?

    <p>It enables sustained contraction without fatigue</p> Signup and view all the answers

    What is the primary factor that contributes to the nearly exclusive reliance on aerobic respiration in cardiac muscle?

    <p>Continuous and rhythmic contraction of the heart</p> Signup and view all the answers

    In what way do the structural properties of cardiomyocytes differ from those of skeletal muscle cells?

    <p>Cardiomyocytes have fewer myofibrils compared to skeletal muscle cells</p> Signup and view all the answers

    Which component of the cardiac conduction system is responsible for coordinating the contraction of the ventricles?

    <p>Purkinje fibers</p> Signup and view all the answers

    How do the structural properties of cardiomyocytes differ from those of skeletal muscle cells?

    <p>Cardiomyocytes have a single nucleus while skeletal muscle cells have multiple nuclei.</p> Signup and view all the answers

    What is the primary factor contributing to the nearly exclusive reliance on aerobic respiration in cardiac muscle?

    <p>The constant and sustained demand for energy by the heart.</p> Signup and view all the answers

    Which component of the cardiac conduction system is responsible for initiating the electrical signals in the heart?

    <p>SA node</p> Signup and view all the answers

    What sets the structural properties of cardiomyocytes apart from those of skeletal muscle cells?

    <p>Presence of intercalated discs for electrical coupling</p> Signup and view all the answers

    How does the nearly exclusive reliance on aerobic respiration in cardiac muscle relate to its unique function?

    <p>Ensures continuous and sustained energy production</p> Signup and view all the answers

    Which component of the cardiac conduction system is responsible for coordinating the contraction of the atria?

    <p>SA node</p> Signup and view all the answers

    What structural property of cardiomyocytes allows for their unique function in the heart?

    <p>Presence of intercalated discs</p> Signup and view all the answers

    How does the nearly exclusive reliance on aerobic respiration in cardiac muscle relate to its unique function?

    <p>It prevents the buildup of lactic acid, maintaining a stable pH in the heart</p> Signup and view all the answers

    Which component of the cardiac conduction system is responsible for coordinating the contraction of the ventricles?

    <p>Purkinje fibers</p> Signup and view all the answers

    What is the primary energy source for cardiac muscle?

    <p>Oxidative phosphorylation</p> Signup and view all the answers

    How do the structural properties of cardiomyocytes differ from those of skeletal muscle cells?

    <p>Multinucleation</p> Signup and view all the answers

    Which component of the cardiac conduction system is responsible for coordinating the contraction of the atria?

    <p>SA node</p> Signup and view all the answers

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