HOSA CPR/First Aid Assessment Practice Test

The tympanic membrane, commonly known as the eardrum, plays a crucial role in hearing by vibrating in response to sound waves. When sound waves enter the ear canal, they strike the tympanic membrane, causing it to vibrate. These vibrations are then transmitted to the ossicles, a chain of three tiny bones in the middle ear, which further amplify and conduct the sound to the inner ear where it can be processed by the brain. This function of vibrating to transmit sound waves is essential for hearing, making it the correct answer.

While the tympanic membrane does contribute to the overall hearing process, its primary role is the conversion of sound wave energy into vibrational energy. Other options, such as filtering sound waves, protecting the inner ear, or amplifying sound, do not accurately describe the specific function of the tympanic membrane. Instead, these actions are managed by different parts of the auditory system. For instance, certain structures in the ear provide protection, while the ossicles are involved in sound amplification.