Hearing 0.0 / 5 ? BiologyneuroscienceUniversityAll boards Created by: JessCreated on: 15-05-14 10:41 What dictates the loudness of a sound wave? The peak-to-peak amplitude. 1 of 21 What dictates the pitch of a sound wave? The periodicity. 2 of 21 What scale is used to measure sound pressure levels? The decibel scale. 3 of 21 What does frequency in Hz represent? How many cycles of the wave there are per second. 4 of 21 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. 5 of 21 What is the role of the Eustachian tube? To balance pressure between the middle and inner ear. 6 of 21 What does the cochlea do? Converts vibration energy into a neural signal. 7 of 21 What effect does a pressure wave have on the eardrum? Causes it to vibrate back and forth. 8 of 21 Where do the bony levers of the Stapes transfer energy to? The oval window. 9 of 21 What bulges out as the oval window moves in? The round window. This causes the fluid to vibrate backwards and forwards. 10 of 21 Name the three fluid filled cavities of the cochlea. Scala vestibuli, scala media, scala tympany. 11 of 21 Which two fluid filled chambers of the cochlea run in continuity? Scala vestibuli and scala tympany. 12 of 21 Which fluid filled chamber of the cochlea is in cotact with the oval window? Scala vestibuli. 13 of 21 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. 14 of 21 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. 15 of 21 Which membrane are the hair cells embedded into? Tectorial membrane. 16 of 21 How many rows of hair cells are there? 1 internal and 3 external. 17 of 21 Which organ is moved up and down due to vibration of the basilar membrane? Organ of Corti. 18 of 21 What does the movement of the basilar membrane do to the hairs? Causes shearing forces on the hairs. 19 of 21 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. 20 of 21 Where do the hair cells release neurotransmitter from? Their base. 21 of 21
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