Nerve Conduction Velocity Quiz
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Questions and Answers

Which factor contributes to the faster breakdown and replenishment of ATP in type II muscle fibers?

  • Greater mitochondrial size
  • More myosin ATPase activity (correct)
  • Larger myelin sheaths
  • Increased myoglobin concentration

    • What is the main process involved in replenishing ATP once phosphocreatine runs out?

  • Glycolysis (correct)
  • Krebs cycle
  • Anaerobic respiration
  • Oxidative phosphorylation

    • What contributes to the fatigue resistance of muscle fibers?

  • Mitochondrial size and number (correct)
  • Myelin sheath thickness
  • Glycolytic enzyme activity
  • Creatine kinase activity

    • What is the primary function of myelin sheaths in nerve axons?

    <p>Facilitate saltatory conduction</p> Signup and view all the answers

    What is the main source of ATP production in the presence of oxygen?

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

    Which muscle fiber type is more metabolically powerful with respect to fast twitch fibers?

    <p>Type IIX</p> Signup and view all the answers

    What is the role of phosphocreatine in ATP replenishment?

    <p>Quickly replenishes ATP via creatine kinase</p> Signup and view all the answers

    What is the primary factor determining the conduction velocity of nerve axons?

    <p>Axon diameter</p> Signup and view all the answers

    Which process allows action potentials to 'leap' from one node to another in nerve axons?

    <p>Saltatory conduction</p> Signup and view all the answers

    What is the main function of myoglobin in muscle fibers?

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

    Which type of muscle fiber mainly performs oxidative phosphorylation?

    <p>Type I</p> Signup and view all the answers

    What is the primary function of Nodes of Ranvier in nerve axons?

    <p>Facilitate saltatory conduction</p> Signup and view all the answers

    What is the primary function of myoglobin in muscle fibers?

    <p>Facilitates oxygen diffusion and storage</p> Signup and view all the answers

    What is the role of Nodes of Ranvier in nerve axons?

    <p>Facilitation of action potential propagation</p> Signup and view all the answers

    What contributes to the faster breakdown and replenishment of ATP in type II muscle fibers?

    <p>Presence of specific creatine kinase</p> Signup and view all the answers

    What is the main source of ATP production in the presence of oxygen?

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

    What is the primary function of myelin sheaths in nerve axons?

    <p>Facilitation of action potential propagation</p> Signup and view all the answers

    Which factor contributes to the fatigue resistance of muscle fibers?

    <p>Increased number of capillaries</p> Signup and view all the answers

    What is the main function of motor units recruitment in muscle fibers?

    <p>Match MU recruitment with task demands</p> Signup and view all the answers

    What is the primary factor determining the conduction velocity of nerve axons?

    <p>Myelin sheath thickness</p> Signup and view all the answers

    What is the main process involved in replenishing ATP once phosphocreatine runs out?

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

    What is the primary function of phosphocreatine in ATP replenishment?

    <p>Acts as a rapid ATP buffer</p> Signup and view all the answers

    What is the main function of muscle fiber diameter and capillarization in oxygen delivery?

    <p>Increase myoglobin's ability to rip oxygen away from hemoglobin</p> Signup and view all the answers

    What is the main function of motor units in muscle fibers?

    <p>Recruit fibers based on task demands</p> Signup and view all the answers

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