organ of Corti 

middle ear 

pinna 

all of the choices 

ear canal 

Allow the influx of Ca++ that is needed for transmitter release after depolarisation

Contain voltage-gated K+ ion channels

Are responsible for the positive charge of the fluid in the cochlear partition

Are arranged in a V-shaped pattern of random heights

Contain mechanically-gated ion channels linked by protein links between stereocilia

Direct mechanical effects on ion channels

Amplification by the mechanical effects of vibration

Direct mechanical effects on enzyme cascades

An efficient cascade system

Amplification from the cascade system