Question

multiple choice 2 points

the ________, another flexible membrane, allows for the smooth displacement of the inner ear fluid caused by the entering sound waves.

• endolymph
• cochlea
• round window
• oval window

Explanation:

Identify the anatomical structures

The question asks for a flexible membrane that allows for the smooth displacement of inner ear fluid caused by entering sound waves. We need to evaluate the roles of the structures listed in the options: Middle Ear Anatomy and Cochlear Anatomy.

Analyze fluid dynamics in the cochlea

Sound waves enter the inner ear via the stapes pushing on the oval window. Because the fluid (perilymph) inside the rigid bony cochlea is incompressible, inward movement at the oval window requires a corresponding outward expansion elsewhere to allow fluid displacement.

Determine the role of the round window

The round window is a membrane-covered opening that vibrates with opposite phase to vibrations entering the inner ear through the oval window. This flexibility allows the fluid within the cochlea to move, which in turn stimulates the hair cells of the organ of Corti, enabling hearing.

Answer:

• endolymph
• cochlea
• round window (Correct answer)
• oval window