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Muscle Physiology Quiz: Neuromuscular Junction, Motor Unit, and Muscle Contraction
10 Questions
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Muscle Physiology Quiz: Neuromuscular Junction, Motor Unit, and Muscle Contraction

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Questions and Answers

Where is the neuromuscular junction found in the muscle fiber?

  • At the beginning of the muscle fiber
  • Near the tendon of the muscle fiber
  • At the end of the muscle fiber
  • In the middle of the muscle fiber (correct)

    • What is the role of acetylcholine (ACh) at the neuromuscular junction?

  • Activates calcium influx into the synaptic vesicles
  • Leads to depolarizing potential called the end-plate potential (EPP) (correct)
  • Opens Ca2+ gates in the membrane
  • Hydrolyzes sodium channels

    • What happens when an impulse reaches the end foot at the neuromuscular junction?

  • Rupture of release sites in the prejunctional membrane
  • Release of acetylcholine (ACh) into the synaptic cleft
  • Hydrolyzation of acetylcholine by acetylcholinesterase (AChE)
  • Ca2+ influx into the cytoplasm (correct)

    • What is the area at which the somatic motor nerve impulse is transmitted from the nerve to the muscle called?

    <p>Neuromuscular junction</p> Signup and view all the answers

    What is the function of acetylcholinesterase (AChE) in the synaptic cleft?

    <p>Hydrolyzes released acetylcholine (ACh)</p> Signup and view all the answers

    What is the end-plate potential (EPP)?

    <p>A nonpropagated transient depolarization of the postjunctional membrane of the motor end-plate</p> Signup and view all the answers

    Which type of muscle is characterized by voluntary control and striated, unbranched, multinucleate cells?

    <p>Skeletal muscle</p> Signup and view all the answers

    What is the main function of muscle in the body?

    <p>Converting potential energy of food into mechanical energy</p> Signup and view all the answers

    What is the characteristic of type IIx muscle fibers in human skeletal muscle?

    <p>High ATPase activity and rapid breakdown of ATP</p> Signup and view all the answers

    What does preloading do to the muscle fibers?

    <p>Stretches the muscle fibers and increases their initial length</p> Signup and view all the answers

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