Hearing L2 Flashcards
T Or F?
The pattern of vibration is not dependent on which end of the cochlea is stimulated.
T
what are otoacoustic emissions
sound emmisions from the inner ear
are the outer hair cells capable of shape changes?
yes
OHCs are capable of shape changes - depolarisation of the cell causes length ______; hyperpolarisation of the cell causes length _______.
OHCs are capable of shape changes - depolarisation of the cell causes length decreases; hyperpolarisation of the cell causes length increases.
what happens when outer hari cells stop working well?
With total loss of OHC function there is a ~ 55 dB loss in thresholds.
![](https://s3.amazonaws.com/brainscape-prod/system/cm/345/620/842/a_image_thumb.png?1620757114)
what are the OHC responsible for?
sensitivity, sharpness of tuning, and oto-acoustic emissions
role of the iHC?
The inner hair cells (IHCs) act to transduce the mechanical events in the cochlea to electrical events in auditory-nerve fibres
how are the OHC involved in a feedback mechanism?
![](https://s3.amazonaws.com/brainscape-prod/system/cm/345/620/925/a_image_thumb.png?1620757235)
describe the The tip-link hypothesis of mechanotransduction
stereocilia are stretched towards the tallest stereocilia (or kinocilium in the vestibular apparatus) the probability of mechanically-gated channels opening increases; if they are stretched away from the tallest stereocilia the probability of them closing increases
![](https://s3.amazonaws.com/brainscape-prod/system/cm/345/621/028/a_image_thumb.png?1620757441)
![](https://s3.amazonaws.com/brainscape-prod/system/cm/345/621/405/q_image_thumb.jpeg?1620757543)
![](https://s3.amazonaws.com/brainscape-prod/system/cm/345/621/405/a_image_thumb.png?1620757555)
where is teh alrgest current changes in hair cells?
at the tips of the steocilia
whats the predominant ion in the endolymph
K+
which ion is likely to carry the transucer current in hair cells?
K+
describe the K+ gradient for hair cells
The resting membrane potential of the cell (-50 mV) coupled with the large endocochlear potential (EP) of +100 mV gives a total gradient of 150 mV
what controls the compositiong of the endolymph?
Stria vascularis.