Study guide for science

The Ear and Sound Study Guide

Assessment on Friday, December 19th

You need to be able to fill out the parts of the ear.
Sound is vibrations that travel in waves.
Alexander Graham Bell invented the telephone with his assistant Mr. Watson. The first words spoken were “Mr. Watson, come here. I want you.”


The “outer ear” is made up of the Pinna and the auditory canal.
The “middle ear” is made up of the ear drum, hammer, anvil, and stirrup. 
The “inner ear” is made up of the cochlea and the auditory nerve.


The reason you feel dizzy after spinning for a period of time is that your brain is confused. It is receiving two messages from your body. One- your semi-circular canals have liquid in them that continues to move after you stop which tells your brain that you are still moving. Two- your legs tell your brain that you have stopped moving. You become dizzy and may fall.


There are many ways to keep your ears healthy. Some of them are…
• Let a doctor remove your earwax when necessary.
• Don’t listen to loud noises for long periods of time.
• Wear hearing protectors like ear plugs or ear muffs if you are going to be around loud noises.
• Don’t ever place sharp things into your ears.


You hear sound…do your hand motions with this to help you remember.
 first- you hit a drum
  Then- vibrations occur
  Your pinna “catches” the sound
  It goes into your auditory canal
  and your eardrum begins to vibrate which vibrates up against the
  hammer, and then the
  anvil, and then the
  stirrup.
  Then it vibrates up against the cochlea which has
  a liquid that begins to move and
  tiny hairs that catch the message. The message is given to
  the auditory nerve which sends it to
  the brain stem/ medulla
  it ends up in the cerebrum and you hear sound.


You should also be able to sign your name with sign language.