Concept:The cochlea is the sensory part of the inner ear that changes sound vibrations into nerve impulses.
Explanation:Sound waves enter the ear and cause the eardrum and the small ear bones to vibrate.
These vibrations pass into the fluid-filled cochlea in the inner ear.
Inside the cochlea is a structure called the organ of Corti.
The organ of Corti contains hair cells, which are the nerve cells sensitive to sound vibrations.
When fluid waves move these hair cells, they generate electrical nerve signals.
The signals travel along the auditory nerve to the brain, where they are perceived as sound.
The other options are not correct:
The ampulla is involved in balance, the tympanum is the eardrum, and the malleus is a middle ear bone.
Answer:A. Cochlea