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How the Ears Work
°ü¸®ÀÚ 2025-09-16 ¿ÀÈÄ 4:41:09 298

 

How the Ears Work  

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Transcription:  


The ears collect sounds and turn them into messages for the brain to interpret. They also send information about balance to the brain.  

Three sections of the ear work together to make this happen: they are the outer ear, the middle ear, and the inner ear.  

The outer ear is made up of the pinna and the ear canal.  

These parts gather sounds from the environment and funnel them into the middle ear.  

The middle ear takes these sounds and turns them into vibrations.  

Sounds that come into the middle ear hit the eardrum, causing it to move. The Eustachian tube helps the eardrum to work well by keeping the air pressure balanced on both sides.  

When the eardrum moves, it makes three small bones, called ossicles, vibrate.  

The vibrations are then sent to the inner ear.  

The inner ear receives vibrations and changes them into messages that go to the brain. These messages are called nerve signals.  

The inner ear is made up the cochlea and the vestibule, which includes the semicircular canals.  

The cochlea has fluid in it that moves like a wave. This happens when vibrations come in from the middle ear. The moving fluid causes hair cells to make nerve signals about sound.  

Semicircular canals also use moving fluid to create nerve signals that help with balance.  

Then, the signals from the cochlea travel along the auditory nerve.  

Signals from the semicircular canals go along the vestibular nerve.  

These two nerves come together and lead to the brain.  

There, the brain decodes the signals to get information about sound and balance. 

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Questions:

 

1. What do ears collect and send to the brain? What are the three sections of the ear? 

2. What are the parts of the outer ear? What does the middle ear do with sound? 

3. What does the cochlea do with the vibrations? What helps the brain know about balance? What two nerves carry signals to the brain? 


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