What is the primary function of the middle ear?

What is the primary function of the middle ear?

• A. To amplify electrical signals from the cochlea.
• B. To produce endolymph.
• C. To convert air-borne vibrations to fluid motion.
• D. To filter out high-frequency sounds.

Answer: (C)

The middle ear’s job is to bridge air vibrations to the fluid-filled inner ear. When air vibrations hit the eardrum, it vibrates and drives the attached ossicles (the tiny bones). These bones act like a lever system and transfer the movement to the oval window, which has a much smaller area than the eardrum. This setup increases the pressure delivered to the cochlear fluids, effectively converting air-borne vibrations into fluid motion so the inner ear can detect them. The other options describe roles of other parts of the auditory system: turning mechanical energy into electrical signals happens in the cochlea’s hair cells, endolymph is produced inside the inner ear, and frequency filtering is primarily a cochlear function, not the middle ear.

The middle ear’s job is to bridge air vibrations to the fluid-filled inner ear. When air vibrations hit the eardrum, it vibrates and drives the attached ossicles (the tiny bones). These bones act like a lever system and transfer the movement to the oval window, which has a much smaller area than the eardrum. This setup increases the pressure delivered to the cochlear fluids, effectively converting air-borne vibrations into fluid motion so the inner ear can detect them. The other options describe roles of other parts of the auditory system: turning mechanical energy into electrical signals happens in the cochlea’s hair cells, endolymph is produced inside the inner ear, and frequency filtering is primarily a cochlear function, not the middle ear.