How are sound vibrations amplified in a vertebrate ear?
A)by movements of the basilar membrane induced by fluid vibrations
B)by movement of the bones of the middle ear
C)by differences in the surface area of the eardrum versus the oval window
D)by movement of the bones of the middle ear and by differences in the surface area of the eardrum versus the oval window

Question

Quizplus · Accepted Answer

Sound vibrations are first collected by the eardrum which vibrates. These vibrations are then amplified by the three bones (malleus, incus, and stapes) in the middle ear that transmit and amplify the vibrations to the oval window. The amplification is aided by the differences in surface area between the eardrum and the oval window. Finally, the fluid vibrations in the cochlea are amplified by movements of the basilar membrane, which stimulates the hair cells responsible for sensing sound.

How Are Sound Vibrations Amplified in a Vertebrate Ear