What is the role of the tympanic membrane in hearing?

• A. It vibrates in response to sound waves to transfer energy to the ossicles
• B. It converts vibrations into neural signals
• C. It produces ear wax
• D. It focuses sound into the cochlea

Answer: (A)

The essential function being tested is how the eardrum handles sound energy. When a sound wave reaches the outer ear, it makes the tympanic membrane vibrate. This vibration converts airborne acoustic energy into mechanical energy and passes it on to the middle-ear chain of small bones. The malleus, incus, and stapes relay and amplify this motion, delivering it to the oval window and into the fluid of the cochlea. There, hair cells translate the mechanical energy into neural signals that travel to the brain.

So, the tympanic membrane’s role is to respond to sound waves by vibrating and transferring that energy to the ossicles. It does not convert vibrations into neural signals itself, produce ear wax, or focus sound into the cochlea.