Psychology / Psych 0423 · Atom · ~20 seconds
The Outer and Middle Ear
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The outer ear collects sound waves and the middle ear's three bones amplify and transfer them to the inner ear.
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Vibration of the eardrum moves three small bones that press against the fluid-filled cochlea.
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Amplification is necessary because air-to-fluid transfer loses energy. Without it, most sound would not register.