Animation 9.9: Frequency Sensitivity of the Basilar Membrane and Auditory CortexClick on the above link to access the Interactive eBook. Once you've signed in, scroll to page 248 and watch the video. When you've finished watching the video, come back to the test and answer the following questions:Which of the following is TRUE about the basilar membrane?
A. Low frequency sounds cause less vibration at the wider end of the membrane.
B. High frequency sounds cause less vibration at the narrow end of the membrane.
C. It starts out wide at the base end and progressively becomes narrower at the apex.
D. It is stiffer at the base end and becomes progressively more elastic toward the apex.
Answer: D
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