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How does the ear work?
Quick answer
The ear works by turning sound waves into electrical signals the brain understands. Sound funnels in and vibrates the eardrum; tiny bones amplify those vibrations into the fluid-filled cochlea, where hair cells convert them into nerve signals sent to the brain.
Step by step
- The outer ear funnels sound waves to the eardrum, making it vibrate.
- Three tiny bones in the middle ear (the smallest bones in the body) amplify those vibrations.
- The vibrations pass into the cochlea, a fluid-filled spiral in the inner ear.
- Hair cells in the cochlea convert the vibrations into electrical nerve signals.
- The auditory nerve carries those signals to the brain, which interprets them as sound.
People also ask
How does the ear turn sound into something the brain understands?
Hair cells in the cochlea convert sound vibrations into electrical signals, which the auditory nerve carries to the brain to be interpreted as sound.
How does the ear help with balance?
Beyond hearing, the inner ear contains fluid-filled canals that sense head movement and position, giving the brain the information it needs to keep you balanced.
Why do ears pop on a plane?
Air-pressure changes push on the eardrum. The Eustachian tube opens (often when you swallow or yawn) to equalize the pressure, which you feel as a 'pop'.
How do we tell high and low sounds apart?
Different spots along the cochlea respond to different pitches, so which hair cells fire tells the brain how high or low the sound is.
Why can loud noise damage hearing?
Very loud sound can flatten or kill the delicate hair cells in the cochlea, and they don't grow back, causing permanent loss.
Part of the guide: How Your Body Works →