The hair cells present on the crista ampullaris receive the stimuli of

Given below is a diagrammatic cross-section of a single loop of the human cochlea. Which one of the following options correctly represents the names of three different parts?

What are the functions of the ear?
$I -$ Hearing
$II -$ Analysis of impulses
$III -$ Body balance
$IV -$ Olfaction

The vestibular apparatus of the human ear is composed of:

The passage connecting the middle ear to the pharynx is called ....

Which of the following is the function of ear ossicles?