The organ of Corti in a rabbit is concerned with the sense of

The $Scala \text{ } tympani$ of the membranous labyrinth ends at $A$, which opens into $B$. Identify $A$ and $B$ and select the correct option.

In mammals,sound wave receptors are

The fluid-filled inner part of the ear is called the .........

$A$ person going up to $10,000$ feet high in a hot air balloon may develop severe pain in the ear due to:

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