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?
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/Check
Review eye paragraph
• 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/L
ongitudinal
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
Hammer Anvil Stirrup
Ear Drum
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
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.
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)
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