Muscle Fiber Types and Energy Systems Quiz
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Questions and Answers

What is the main source of ATP during exercise in Fast-Twitch Glycolytic muscle fibers?

  • Aerobic metabolism
  • Glycogenolysis
  • Anaerobic glycolysis (correct)
  • Oxidative phosphorylation
  • Which type of muscle fiber has a high glycolytic capacity due to the presence of large amounts of glycolysis enzymes?

  • Type IIB Fast-Twitch Glycolytic fibers (correct)
  • Type I Slow-Twitch Oxidative fibers
  • Type IIC Intermediate muscle fibers
  • Type IIA Fast-Twitch Oxidative-Glycolytic fibers
  • What inhibits hexokinase as a result of glycogenolysis during muscle contraction?

  • Glucose
  • Fructose 6-phosphate
  • Glucose 6-phosphate (correct)
  • Pyruvate
  • Which metabolic pathway provides most of the ATP requirement for muscle fibers at the onset of exercise?

    <p>Anaerobic glycolysis</p> Signup and view all the answers

    What characterizes Fast-Twitch muscle fibers in terms of contraction speed and glycolytic capacity?

    <p>Fast contraction speed, high glycolytic capacity</p> Signup and view all the answers

    Which type of muscle has long, cylindrical fibers that are multinucleated due to cell fusion during embryogenesis?

    <p>Skeletal muscle</p> Signup and view all the answers

    What is the primary energy source utilized by the heart for energy production?

    <p>Fatty acids</p> Signup and view all the answers

    Which protein is absent in Duchenne's muscular dystrophy, leading to muscle atrophy and respiratory muscle failure?

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

    What structural feature differentiates slow-twitch muscle fibers from fast-twitch muscle fibers?

    <p>Presence of mitochondria and myoglobin</p> Signup and view all the answers

    In which type of muscle does muscle contraction occur via an actin/myosin sliding filament system regulated by intracellular calcium levels?

    <p>Skeletal muscle</p> Signup and view all the answers

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