10 Questions
Which structure in the organ of Corti moves due to sound vibrations transmitted by the stapes?
Scala vestibuli
Which of the following ions enter the hair cells when ion channels open due to stereocilia bending?
Potassium and calcium
What substance is released when potassium and calcium enter the hair cell, triggering activation of cochlear nerves?
Glutamate
Which part of the organ of Corti lies free in the scala media and is attached only on one side?
Tectorial membrane
What happens when the basilar membrane vibrates due to pressure waves in the scala vestibuli and scala media?
The hair cells move against the tectorial membrane
Which component of the cochlear apparatus does not play a direct role in transmitting sound vibrations to the hair cells?
Scala tympani
Which type of ion channel opens when the stereocilia bend due to movements of the basilar membrane?
Mechanically-gated ion channels
What happens immediately after the activation of postsynaptic cochlear nerves due to glutamate release?
The nerve impulse is transmitted to the auditory cortex
If the stereocilia do not bend, which of the following processes does not occur?
Opening of ion channels
What is the mechanism behind the hair cells' response to sound waves?
Mechanical displacement of the basilar membrane
Test your knowledge of the ear's structure, function, physiology of hearing, and the role of the vestibular apparatus. Questions cover the outer, middle, and inner ear, cochlea, organ of Corti, and more.
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