The Physiology of Muscle
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Questions and Answers

Which of the following is NOT a method for recording changes in muscle activity?

  • Equal repetitive stimulation
  • Recording electrical changes in muscle
  • Recording mechanical changes in skeletal muscle during activity
  • Simple Muscle Twitch (correct)
  • What stimulates skeletal muscles to contract?

  • Somatic motor nerves (correct)
  • Nerve impulses from the brain
  • Nerve impulses from the spinal cord
  • Chemical energy
  • What is the primary function of the muscle?

  • Converting mechanical work to chemical energy
  • Recording mechanical changes
  • Converting electrical stimulus to mechanical work (correct)
  • Recording electrical changes
  • What controls the degree of muscle contraction?

    <p>The number of activated motor units within the muscle</p> Signup and view all the answers

    What does Starling's Law state about muscle contraction?

    <p>The strength of the muscle contraction is directly proportional to the initial length of the muscle</p> Signup and view all the answers

    Which type of nerve conduction occurs in unmyelinated nerve fibers?

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

    What is the maximum distance that nodes of Ranvier can be separated in myelinated nerve fibers?

    <p>1-2 mm</p> Signup and view all the answers

    What is the primary function of saltatory conduction?

    <p>To increase the speed of conduction</p> Signup and view all the answers

    What serves as the depolarization stimulus for the next region of the axon membrane?

    <p>The action potential produced at the initial segment of the axon</p> Signup and view all the answers

    What is the process by which adjacent portions of the membrane are excited by the conduction of an action potential?

    <p>Local circuit conduction</p> Signup and view all the answers

    Study Notes

    Muscle Physiology

    • Electromyography (EMG) is a method for recording changes in muscle activity.
    • Muscle contraction is stimulated by the release of acetylcholine (ACh) from the motor neuron.
    • The primary function of the muscle is to generate force or movement.

    Muscle Contraction Control

    • The degree of muscle contraction is controlled by the frequency of muscle stimulation.

    Starling's Law

    • Starling's Law states that the force of muscle contraction is proportional to the initial length of the muscle fibers.

    Nerve Conduction

    • Unmyelinated nerve fibers exhibit continuous conduction.
    • In myelinated nerve fibers, nodes of Ranvier can be separated by a maximum distance of 1-2 mm.
    • The primary function of saltatory conduction is to increase the speed of action potential propagation.
    • The depolarization stimulus for the next region of the axon membrane is the action potential itself.
    • The process by which adjacent portions of the membrane are excited by the conduction of an action potential is called propagation.

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    Description

    Test your knowledge of the physiology of muscle with this practical quiz presented by Asmaa Samy El Naggar. Learn about recording electrical and mechanical changes in muscle activity, including simple muscle twitch and equal repetitive stimulation. Explore how skeletal muscles are stimulated to contract through somatic motor nerves.

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