Which part of the ear is normally filled with fluid to aid in the transmission of sound waves?

A. auditory canal
B. Cochlea
C. Semicircular Canals
D. Malleus

The cochlea is the fluid filled part of the ear that transmits sound.

B.

Mountainpenguin: The Semicircular canals are usually considered organs of balance, not hearing.

The auditory canal is not filled with fluid

the cochlea is split into three canals, the scala vestibuli which contains perilymph (a fluid), the scala media which contains endolymph (also a fluid) and the scala tympani which contains perilymph. So the cochlea is filled with fluid

the semicircular canals are filled with endolymph.
so the semicircular canals are also filled with fluid

the malleus is a bone so is not filled with fluid

The answers are: B and C

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