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Motor Unit Fibers Overview
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Motor Unit Fibers Overview

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Questions and Answers

What type of fibers are predominant in the drumstick of a chicken or turkey?

  • Cardiac fibers
  • Slow twitch fibers (correct)
  • Intermediate twitch fibers
  • Fast twitch fibers
  • What acts as the regulatory subunit for myosin light chain kinase in muscle cells?

  • Collagen
  • Calmodulin (correct)
  • Troponin
  • Myoglobin
  • What type of enzyme is myosin light chain kinase?

  • Hydrolase enzyme
  • Phosphatase enzyme
  • Kinase enzyme (correct)
  • Ligase enzyme
  • What is the role of myosin light chain phosphorylation in muscle contraction?

    <p>Promotes cross-bridge cycling</p> Signup and view all the answers

    What do all kinases have in common in terms of their enzymatic activity?

    <p>Add phosphate groups to proteins</p> Signup and view all the answers

    Where are the thin filaments attached in muscle cells that lack Z-lines?

    <p>Dense bodies</p> Signup and view all the answers

    What type of muscle fibers are most fuel-efficient and tend to be weaker?

    <p>Slow-oxidative fibers</p> Signup and view all the answers

    Which type of muscle fibers are important for power and endurance, suitable for mile track runners?

    <p>Fast-oxidative fibers</p> Signup and view all the answers

    What is the main function of creatine phosphate in muscle cells?

    <p>Energy storage</p> Signup and view all the answers

    Which process results in a lower ATP yield but is faster and anaerobic?

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

    What is the function of myoglobin in muscle cells?

    <p>Oxygen binding and transportation</p> Signup and view all the answers

    Which type of muscle fibers are the most powerful but the least efficient in fuel utilization?

    <p>Fast-glycolytic fibers</p> Signup and view all the answers

    What is the term used to describe the rigid cross-linking of thick filaments to thin filaments in muscles?

    <p>Rigor associated with death</p> Signup and view all the answers

    What initiates the binding step in muscle contraction that is calcium dependent?

    <p>ATP presence</p> Signup and view all the answers

    What causes the displacement of the Myosin head during muscle contraction?

    <p>Spontaneous conformational change</p> Signup and view all the answers

    Which process re-energizes the Myosin head during muscle contraction?

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

    In muscle cells, what triggers the activation of contraction in response to neuromuscular transmission?

    <p>Acetylcholine release</p> Signup and view all the answers

    What event causes an excitatory end-plate potential leading to an action potential in the muscle membrane?

    <p>Release of acetylcholine</p> Signup and view all the answers

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