Neurophysiologic Background for Therapeutic Exercises
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Questions and Answers

What does the irritability of the motor unit determine?

  • The duration of discharge of impulses along one motor unit
  • The ability of muscle to contract
  • The amount of muscle fiber required to initiate a response
  • The amount of stimulation required to initiate the response of a muscle fiber (correct)

    • What is necessary to cause a response in muscle fiber?

  • Threshold stimulation (correct)
  • Contractility
  • Irritability of the motor unit
  • Sub-threshold stimulation

    • What happens if the stimulus is above the threshold level?

  • No muscle activity occurs
  • The muscle contracts involuntarily
  • Muscle relaxation occurs
  • More motor units respond (correct)

    • What is the mechanical response after depolarization?

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

    What is simply the ability to contract?

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

    What is the general rule of viscosity as applied to muscle activity?

    <p>The faster the rate of muscle contraction, the greater the internal resistance and the less the external force that can be exerted by the muscle</p> Signup and view all the answers

    According to Hooke's law, what happens when a stress is applied to stretch a muscle fiber?

    <p>The change in length produced is proportional to the stress applied</p> Signup and view all the answers

    What is stiffness in relation to tissues and structures?

    <p>Stiffness is the resistance of tissue or a structure to deformation or change in shape or length</p> Signup and view all the answers

    What can result in fatigue according to the text?

    <p>Both A and B</p> Signup and view all the answers

    What is contracture in relation to muscle physiology?

    <p>Contracture is a failure of relaxation of a muscle</p> Signup and view all the answers

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