Question

multiple choice question
what happens to the tympanic membrane when sound waves pass down the external acoustic meatus?
the tympanic membrane does not change its status.
the tympanic membrane stops the progression of sound waves due to its stiffness.
the tympanic membrane vibrates.
the tympanic membrane thickens.

Explanation:

Sound waves cause the tympanic membrane to vibrate as they travel through the external acoustic meatus, which is a key part of the sound - conduction pathway in the ear.

Answer:

The tympanic membrane vibrates.