Hearing

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  • Created by: Jess
  • Created on: 15-05-14 10:41
What dictates the loudness of a sound wave?
The peak-to-peak amplitude.
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What dictates the pitch of a sound wave?
The periodicity.
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What scale is used to measure sound pressure levels?
The decibel scale.
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What does frequency in Hz represent?
How many cycles of the wave there are per second.
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What are the Malleus, Incus and Stapes otherwise known as and what is their function?
Hammer, Anvil and Stirrup. To transfer the energy of vibration to the inner ear.
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What is the role of the Eustachian tube?
To balance pressure between the middle and inner ear.
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What does the cochlea do?
Converts vibration energy into a neural signal.
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What effect does a pressure wave have on the eardrum?
Causes it to vibrate back and forth.
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Where do the bony levers of the Stapes transfer energy to?
The oval window.
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What bulges out as the oval window moves in?
The round window. This causes the fluid to vibrate backwards and forwards.
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Name the three fluid filled cavities of the cochlea.
Scala vestibuli, scala media, scala tympany.
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Which two fluid filled chambers of the cochlea run in continuity?
Scala vestibuli and scala tympany.
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Which fluid filled chamber of the cochlea is in cotact with the oval window?
Scala vestibuli.
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What is the basilar membrane?
A thicker membrane between the scala tympany and the scala media where the hair cells responsible for detecting vibrations sit.
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Which fluid filled cavity has a higher K content and why?
Scala media. Due to cells in the stria vascularis actively pumping in K ions.
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Which membrane are the hair cells embedded into?
Tectorial membrane.
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How many rows of hair cells are there?
1 internal and 3 external.
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Which organ is moved up and down due to vibration of the basilar membrane?
Organ of Corti.
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What does the movement of the basilar membrane do to the hairs?
Causes shearing forces on the hairs.
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Describe the cilia of the hair cells.
1 large kinocillium and several stereocillia linked by proteins. Bending causes ionic flux stimulating or inhibiting the hair cell.
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Where do the hair cells release neurotransmitter from?
Their base.
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Other cards in this set

Card 2

Front

What dictates the pitch of a sound wave?

Back

The periodicity.

Card 3

Front

What scale is used to measure sound pressure levels?

Back

Preview of the front of card 3

Card 4

Front

What does frequency in Hz represent?

Back

Preview of the front of card 4

Card 5

Front

What are the Malleus, Incus and Stapes otherwise known as and what is their function?

Back

Preview of the front of card 5
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