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Biol 216 Sound Lecture Notes

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This is a comprehensive and detailed note on; Sounds for Biol 216. *Essential Study Material!!

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  • October 6, 2024
  • 2
  • 2021/2022
  • Class notes
  • Prof. rebecca
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anyiamgeorge19
Detection of sound vibrations: hair cells arranged in rows of inner hair cells (responsible
for hearing) and outer hair cells (regulate tension on basilar membrane)
• Tip link (gating spring): attaches tip of each stereocilium in hair bundle to side of
longer stereocilium; as stereocilia bend, they open K+ gates (mechanically gated
ion channel)



Bending steriocilia in one direction
depolarizes the cell and stimulates
neurotransmitter release.

Bending in the opposite direction
repolarizes the cell and stops the release.




• Basilar membrane is narrow and stiff (HIGH PITCH) near oval window, wider at
outer end of cochlear duct (LOW PITCH); Hair cells in organ of Corti "tuned" to
certain sound frequencies by way of location in cochlea due to degree of stiffness
in membrane

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