HW # 37 - Complete the take home quiz on the eye and ear. Finish coloring your ear diagram.

1. Week 10, Day Two HW # 37- Complete the take home quiz on the eye and ear. Finish coloring your ear diagram. Warm up What happens when you get an ear infection?

2. Warm up Response Middle ear infections usually occur along with an upper respiratory infection (URI), such as a cold. During a URI, the lining of the eustachian tube can swell and block the tube. Fluid builds up in the middle ear, creating a perfect breeding ground for bacteria or viruses to grow into an ear infection. Pus develops as the body tries to fight the ear infection. More fluid collects and pushes against the eardrum, causing pain and sometimes problems hearing. Antibiotic treatment may shorten some symptoms. But most of the time the immune system can fight infection and heal the ear infection without the use of these medicines. Children under 2 are treated with antibiotics, because they are more likely to have complications from the ear infection.

3. Homework Response/Check Review eye paragraph

4. Goals for Today • The Ear

5. The Ear & Sound

6. Sense Organs • The sense organs gather information (light, sound, heat, and pressure) from the environment. • Eyes, ears, nose, tongue, and skin are examples

7. Hearing • When a sound is made, the air around the sound vibrates. • Hearing starts when some of the sound waves go into the ear.

8. Sound Waves • Sound is a series of waves that move through matter. • Sound does not travel through a vacuum.

9. Sound • Sound moves at approximately 344 meters per second (770 miles per hour) at room temperature • When a sound wave hits an object, it causes the object to vibrate. This leads to you to be able to detect sound.

10. Sound Waves • Compression/Longitudinal waves: Sound travels in waves through the atmosphere. • Sound can travel in transverse waves through solids.

11. 3 Main Parts of the Ear • Outer Ear • Middle Ear • Inner Ear

12. Sound waves traveling through the ear

13. Outer Ear • The part that you can see. • Directs sound into the ear

14. Middle Ear • Ear canal: the tube between the outside of the ear and the ear drum. • Ear drum: Vibrates when sound waves hit it.

15. Middle Ear Bones • The three smallest bones in the body are in the middle ear. • Hammer • Anvil • Stirrup • Vibrations travel from ear drum -> Hammer -> Anvil -> Stirrup -> Inner ear

16. Middle Ear Hammer Anvil Stirrup Ear Drum

17. Inner Ear • Cochlea: fluid-filled organ in inner ear • Vibrations makes waves, which send message to nerve • Auditory nerve: carries the hearing information to the brain and the brain tells us what we heard. Cochlea

18. The Ear & Balance Semi-circular Canals • Semicircular Canals: fluid-filled canals in your ear that contain hair cells • As you move, the hair moves from the liquid and sends messages to your brain about how you are moving.

19. Hearing Loss Presbycusis: lose hearing as you age; runs in families; also caused due to extended exposure to loud noises Sudden Sensorineural Hearing Loss (SSHL): rapid loss of hearing; usually only one ear; more than 100 possible causes (disease, trauma, abnormal tissue growth, etc.) Noise-Induced Hearing Loss: caused by loud sounds, can be sudden (ex: explosion) or over time (ex: wood- shop)

20. Hearing Loss Pendred syndrome: genetic disorder where early hearing loss occurs in children (by age 3) Meniere’s disease:a disorder of the inner ear that causes severe dizziness, ringing in the ears, hearing loss, and a feeling of fullness or congestion in the ear; usually affects only one ear; caused by build-up of fluid in the inner ear