1. EQ: How do you hear sound?
How You Hear Sound
EQ: How do you hear sound?

2. The Ear There are three main sections of the ear: Outer Ear Middle Ear
Inner Ear

3. Outer Ear – Funnels sound waves
Curved section of ear collects sound
Ear canal – funnels sound to the ear drum. Few centimeters long
Eardrum – small, tightly stretched, drum like membrane. Sound waves make it vibrate

4. Middle Ear Contains the body’s three smallest bones
The hammer is attached to the ear drum. When the eardrum vibrates, the hammer does too. Then the hammer hits the anvil and shakes the stirrup
anvil
stirrup
hammer

5. Inner Ear
Cochlea – cavity shaped like a snail shell, that is filled with liquid. Inside it is filled with more than 10,000 hairs.

6. Inner Ear
When the stirrup vibrates against the membrane, the vibrations pass into the cochlea. As the liquid moves, the hairs sway back and forth. The nerve endings attached to the hairs send a message to the brain …sound has arrived!

7. Hearing Loss
Occurs from injury, infection or aging

8. “Old MacDonald ... Had Two Ears”

9. With an outer ear, middle ear
Verse One
Old MacDonald Had Two Ears E… I… E… I… …O
Three parts each so he could hear
E… I… E… I… …O
With an outer ear, middle ear
Inner ear hear, Inner ear there Here an ear, there an ear Everywhere an ear, ear
Old MacDonald Had Two Ears

10. Sound Waves enter the outer ear E… I… E… I… …O
They hit the drum and it is clear
With a Wave, Wave here and a Wave, Wave there
Here a Wave, there a Wave, everywhere a Wave, Wave
An outer ear, middle ear
Inner ear hear, Inner ear there Here an ear, there an ear
Everywhere an ear, ear
Sound waves enter the outer ear

11. Vibrations move the little bones E… I… E… I… …O
Moving fluid so we hear tones E… I… E… I… …O
With a Whoosh, Whoosh here, and a Whoosh, Whoosh there
Here a Whoosh, there a Whoosh,
Everywhere a Whoosh, Whoosh
Wave, Wave here and a Wave, Wave there
Here a Wave, there a Wave, everywhere a Wave, Wave
An outer ear, middle ear Inner ear hear, Inner ear there
Here an ear, there an ear Everywhere an ear, ear
Vibrations move the little bones E… I… E… I… …O

12. This moving fluid signals my brain E… I… E… I… …O
I hear the sound of a jet airplane E… I… E… I… …O
With a Zoom, Zoom here, and a Zoom, Zoom there
Here a Zoom, there a Zoom, everywhere a Zoom, Zoom
Whoosh, Whoosh here, and a Whoosh, Whoosh there
Here a Whoosh, there a Whoosh, Everywhere a Whoosh, Whoosh
Wave, Wave here and a Wave, Wave there
Here a Wave, there a Wave, everywhere a Wave, Wave
An outer ear, middle ear Inner ear hear, Inner ear there
Hear an ear, there an ear Everywhere an ear, ear
Sound Waves signal my own brain!!!
E… I… E… I… …O !!

13. Class Work and Homework
Fill In
What did I learn
Confused
Say
Read pages O 62 – O 64
Questions 1-5, page O 64