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?

Week 10, Day Two

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.

Homework Response/CheckReview eye paragraph

Goals for Today

• The Ear

The Ear & Sound

Sense Organs

• The sense organs gather information (light, sound, heat, and pressure) from the environment.

• Eyes, ears, nose, tongue, and skin are examples

Hearing

• When a sound is made, the air around the sound vibrates.

• Hearing starts when some of the sound waves go into the ear.

Sound Waves

• Sound is a series of waves that move through matter.

• Sound does not travel through a vacuum.

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.

Sound Waves

• Compression/Longitudinal waves: Sound travels in waves through the atmosphere.

• Sound can travel in transverse waves through solids.

3 Main Parts of the Ear

– Outer Ear– Middle Ear– Inner Ear

Sound waves traveling through the ear

Outer Ear

• The part that you can see.

• Directs sound into the ear

Middle Ear• Ear canal: the tube between the

outside of the ear and the ear drum.• Ear drum: Vibrates when sound

waves hit it.

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

Middle Ear

Ear Drum

Hammer Anvil Stirrup

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

The Ear & Balance

• 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.

Semi-circular Canals

Hearing LossPresbycusis: lose hearing as you age; runs in families; also caused due to extended exposure to loud noisesSudden 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)

Hearing LossPendred 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