Any source of sound sends vibrations or sound waves
into the air. These funnel through the ear opening, down the external ear canal,
and strike your eardrum, causing it to vibrate. The vibrations are passed to
the three small bones of the middle ear,
which transmit them to the cochlea.
The cochlea contains tubes filled with fluid. Inside one of the tubes, tiny
hair cells pick up the vibrations and convert them into nerve impulses. These
impulses are delivered to the brain via the hearing nerve. The brain interprets
the impulses as sound (music, voice, a car horn, etc.).
CLICK HERE to see animated video of how the ear works
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