RCSI MNSR 27 Ear Anatomy and Function Quiz
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Questions and Answers

Which structure in the organ of Corti moves due to sound vibrations transmitted by the stapes?

  • Scala media
  • Scala tympani
  • Tectorial membrane
  • Scala vestibuli (correct)
  • Which of the following ions enter the hair cells when ion channels open due to stereocilia bending?

  • Potassium and calcium (correct)
  • Calcium and chloride
  • Magnesium and potassium
  • Sodium and chloride
  • What substance is released when potassium and calcium enter the hair cell, triggering activation of cochlear nerves?

  • GABA
  • Dopamine
  • Glutamate (correct)
  • Acetylcholine
  • Which part of the organ of Corti lies free in the scala media and is attached only on one side?

    <p>Tectorial membrane</p> Signup and view all the answers

    What happens when the basilar membrane vibrates due to pressure waves in the scala vestibuli and scala media?

    <p>The hair cells move against the tectorial membrane</p> Signup and view all the answers

    Which component of the cochlear apparatus does not play a direct role in transmitting sound vibrations to the hair cells?

    <p>Scala tympani</p> Signup and view all the answers

    Which type of ion channel opens when the stereocilia bend due to movements of the basilar membrane?

    <p>Mechanically-gated ion channels</p> Signup and view all the answers

    What happens immediately after the activation of postsynaptic cochlear nerves due to glutamate release?

    <p>The nerve impulse is transmitted to the auditory cortex</p> Signup and view all the answers

    If the stereocilia do not bend, which of the following processes does not occur?

    <p>Opening of ion channels</p> Signup and view all the answers

    What is the mechanism behind the hair cells' response to sound waves?

    <p>Mechanical displacement of the basilar membrane</p> Signup and view all the answers

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