High-frequency resonance of the basilar membrane occurs at the .........

The sensation of hearing is produced as a result of the:

The diagram shows a cross-section of the human cochlea. Which one of the following options correctly identifies the three parts labeled $A$,$B$,and $C$?

The opening in the nasopharynx that permits air pressure on both sides of the tympanic membrane of the ear to be kept equal is

$.....P.....$ ends at the oval window,while $.....Q.....$ ends at the round window,which opens to the middle ear.
$\quad\quad\quad P\quad\quad \quad Q$

The labyrinth,a fluid-filled inner ear,consists of: