Cochlear Physiology and Electrophysiology

Multiple Choice

Receptor potential is also called Cell Voltage.

• True

• False

Multiple Choice

Depolarization is

• Cells more positively charged

• Cells more negatively charged

Multiple Choice

Which of the following proteins is most closely associated with electromotility

•     Actin

• Myosin

• Prestin

• Tubulin

Multiple Choice

When hair cells are sitting at their resting potential, they have a _________ charge

• Positive

• Negative

Multiple Choice

When hair cell stereocilia are deflected towards the longest stereocilia, the hair cell is ________________ and the voltage becomes _____________positively charged.

• Hyperpolarized, Less

• Depolarised, Less

• Hyperpolarised, more

• Depolarised, More

Multiple Choice

Inner and Outer hair cells have the different resting potential voltage.

• True

• False

Multiple Choice

The changes in the receptor potential for the inner hair cells sharpen and more finely tune the traveling wave.

• True

• False

Multiple Choice

Hair cell’s voltage (receptor potential) is increases with rarefaction and decreases with condensation.

• True

• False

Multiple Choice

For the 300 Hz tone, are you primarily seeing AC or DC voltage changes for this hair cell?

• AC

• DC

• I see both

• I am not seeing anything.

Multiple Choice

 For the 5000 Hz tone, are you primarily seeing AC or DC voltage changes for this hair cell?

• AC

• DC

• I see both

• I can't see anything

Multiple Choice

The match between the sound that is presented and the region of the cochlea where a hair cell is located will influence whether you see a DC shift.

• True

• False

Multiple Choice

Stria vascularis is connected to/located adjacent to

• Spiral Lamina

• Spiral Ligament

• Tectorial membrane

• Spiral ganglion

• None of the above

Multiple Choice

Endocochlear potential is a clinical measure used to assess strial function in patients.

• True

• False

Multiple Choice

Which of the following electrodes are non invasive?

• Transtympanic

• Tymptrode:

• Tiptrode:

Multiple Choice

How does the amplitude of the evoked CM, SP, and AP responses will change when going from transtympanic to tymptrode to tiptrode as a function of which electrode methodology is selected?

• Measured response decreases

• Measured response increases

• Measured response remains same

• Inadequate information

Multiple Choice

OHC's dominates CM response because

• They are more in number than IHC

• OHCs are closer to recording site

• IHC do not contribute toward CM

• All of the above

Multiple Choice

Cells located in the base of the cochlea dominate the CM response. This is due to

• More number in basal portion

• Proximity to recording site

• Both

• None

Multiple Choice

Cochlear microphonic occur BEFORE the action potential because of proximity to recording site.

• True

• False