Describe the course of hearing from the time a sound wave passes into the outer ear until the time that a signal is passed along to the auditory nerve
What will be an ideal response?
Answer: A good answer will include the following key points.
• A sound wave enters the outer ear and strikes the eardrum, causing it to vibrate with the same frequency as the wave itself.
• This vibration is passed along to three tiny bones in the middle ear, which intensify the force of the vibration.
• The innermost bone pushes on a membrane that opens into the inner ear.
• This creates a wave in the fluid-filled cochlea of the inner ear.
• The auditory receptors are called hair cells, and they are located on the basilar membrane in the cochlea.
• The cilia on the hair cells bend in response to the movement of the fluid.
• This causes the hair cells to initiate a signal that is passed along to the auditory nerve, which carries the signal to the brain.
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