A good Resource on Web: http :// www.ndt-ed.org/EducationResources/HighSchool/Sound/humanear.htm

1. #67 Daily Learning Target:I will be able to describe the process of hearing sound as evidenced by creating mini-posters in a group.Exit Question:Name three parts of the ears and functions. A good Resource on Web: http://www.ndt-ed.org/EducationResources/HighSchool/Sound/humanear.htm

2. Finish • #68 Classnotes: Eyes • #69 Handout: The Mammalian Eye • #70 Eye Dissection or Comic Book • #71 18.2 Section Review p. 400

3. #72 Classnotes: Sound and Ears • What is Sound? • Vibrations you can hear with your ear.

4. How is sound Created? • Sound is created through waves. • Waves are vibrations that transfers energy from one place to another. • Sound is created by pressure waves. • Have both high and low pressure regions.

5. How Do Humans Hear? • Humans process 2 characteristics of sound • Frequency ; Pitch • Decibels http://www.neok12.com/php/watch.php?v=zX66794c6171556865655e67&t=Nervous-System

6. Wave Frequency • The number of vibrations per second. • Measured in hertz (Hz). • Humans can hear 20 Hz – 20,000 Hz

7. Pitch is how we hear frequency • The pitch of a sound is how we hear and interpret its frequency. • Low frequency will have a low pitch. • High frequency will have a high pitch. • Test

8. Loudness • The loudness of a sound is measured in decibels (dB). • http://www.brainpop.com/science/energy/sound/

9. Ear -divided into three parts Eustation tube leading to throat inner ear middle ear outer ear

10. ear bones ear canal eardrum cochlea ear lobe-Pinna Structure of ear p.408 middle ear outer ear Semicircular Canals inner ear

11. The Outer Ear • Structures: Pinna or Ear Lobe and ear canal Function: Collects sound waves

12. The Middle Ear • Structures: • Eardrum, • 3 tiny bones: Malleus, Incus and the Stapes, • Air Filled cavity • Functions: • The ear drum vibrates as the sound wave reaches it • The ear drum vibrates against the bones and the stapes hits the inner ear

13. Middle Ear Diagrams

14. The Inner Ear Function: • balance and hearing Structures: • Semicircular canals- contains • fluid that tells the brain where the body is in space (balance) • Cochlea- tiny fluid filled cavity with hair cells that contain nerve fibers, which convert sound waves into electrical signals sent to the brain through the auditory nerve (hearing)

15. Inner Ear Up Close • http://www.brainpop.com/health/bodysystems/hearing/

16. What are the functions of different parts?

17. Lets go to page #73 • Handout: Part of the Human Ear Pg.73 • Color & Label the ear diagram

18. Today’s Group ActivitySound Mini-Poster x4

19. Desk in groups of 4 Not acceptable Almost Acceptable Acceptable

20. Directions • You are going to be making a poster about Sound & hearing with your table. • It is actually going to be 4 mini-posters put together to make 1 regular size poster.

21. Directions Each Group member has to make one mini poster 1 – Sound 2 – Properties of Sound 3 –Outer Ear & Middle Ear 4 – Inner Ear

22. Essential Questions for each topic 1-Sound What is sound? What are its characteristics? 2- Properties of Sound What are the properties of sound? How do they help you hear? 3- Outer Ear & Middle Ear What is the outer ear? What is its purpose? Middle Ear What is the middle ear? What is its purpose? 4-Inner Ear What is the inner ear? What is its purpose?

23. Exit Question • Please complete.

24. A The messages are sent along the auditory nerve to the brain. The brain interprets these messages as sounds. BThe three ear bones magnify the vibrations in the eardrum and pass them to the inner ear. CThe ear flap collects sound vibrations in the air. D The eardrum vibrates when sound vibrations hit it. EThe liquid in the inner ear vibrates. The sensory cells inside the cochlea detect the vibrations and change them into messages. F The sound vibrations travel along the ear canal to the eardrum.