Muscle Recruitment Mechanisms in Exercise Physiology
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Questions and Answers

What is the main function of autonomic nerves in relation to involuntary muscles?

  • Produce both excitatory and inhibitory effects (correct)
  • Produce an inhibitory effect
  • Have no effect on involuntary muscles
  • Produce an excitatory effect
  • Which region of the brainstem is responsible for the 'fight or flight' aspect of the autonomic nervous system?

  • Diencephalon
  • Pons
  • Medulla (correct)
  • They all contribute equally
  • In motor unit anatomy, how many muscle fibers generally receive input from one motor neuron?

  • More than 10
  • 5-10
  • Only 1 (correct)
  • 2-3
  • What does a motor neuron pool consist of?

    <p>All the motor neurons that innervate one muscle</p> Signup and view all the answers

    Which step occurs first in the excitation process at the neuromuscular junction (NMJ)?

    <p>ACh releases from vesicles in axons</p> Signup and view all the answers

    How does the number of muscle fibers per motor neuron relate to a muscle's specific movement function?

    <p>More fibers result in finer control</p> Signup and view all the answers

    What is one way to increase muscle force production through neuromuscular communication?

    <p>Increase the number of motor units recruited</p> Signup and view all the answers

    How does repetitive stimuli affect muscle tension?

    <p>It increases total tension by preventing muscle relaxation</p> Signup and view all the answers

    Which factor affects the nerve's conduction velocity and, in turn, influences motor unit discharge frequency?

    <p>Muscle size</p> Signup and view all the answers

    What major factor distinguishes skilled from unskilled muscle performance according to the Size Principle of Motor Unit Recruitment?

    <p>Control of motor unit firing patterns</p> Signup and view all the answers

    What is one characteristic that can lead to selective recruitment of type II motor units in muscle actions?

    <p>Change in direction of exerted forces</p> Signup and view all the answers

    What is one component that impacts voluntary muscle action during fatigue?

    <p>Decrease in force capacity with repeated stimulation</p> Signup and view all the answers

    What is the main purpose of endplate potentials spreading from motor endplate to extra-junctional sarcolemma of muscle?

    <p>To spread to inner structures of the muscle fiber to prime the contractile machinery for excitation</p> Signup and view all the answers

    How are motor units classified based on the muscle fibers they innervate?

    <p>By a combination of physiologic and mechanical properties</p> Signup and view all the answers

    What influences the muscle fiber type in a motor unit?

    <p>The designation of the motor unit</p> Signup and view all the answers

    According to the All-or-None Principle of Tension Generation, what happens when a stimulus triggers a motor neuron action potential?

    <p>All muscle fibers in the motor unit contract synchronously</p> Signup and view all the answers

    How does the force of muscle action vary according to the text?

    <p><code>It varies from slight to max</code></p> Signup and view all the answers

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