refraction of light- skin Flashcards
refraction of light
ray of light bend
another word for near sighted
myopia
what is wrong with the eyeball in myopia
too long
where does the image fall in myopia
infront of the retina
what type of lenses help myopia
concave
nearsighted summary
myopia, see near not far, image in front of retina, concave lenses
what is the problem with nearsighted people
see near not far
another word for far sighted
hyperopia
what the problem with far sighted people
they can see far not near
what is the problem with the eyeball in hyperopia
eyeball too short
where does the image fall in hyperopia
image falls behind retina
what type of lenses help hyperopia
convex
what is an astigmatism
blurred vision/ shape of cornea is irregular/ a little bumpy/ everyone has it
what is the shape of the cornea like in astigmatism
irregular
who has astigmatism
everyone supposedly
where is the hearing center
the brain
another name for auricle
pina
auricle
in the outer ear/ pina/ made of cartilage< not a lot of blood
what is the only sense organ that keeps growing
ear
external auditory canal
contains hair, wax glands
what is ear wax supposedly connected to
race
what is required to have a hearing aid
some kind of hearing
what 2 things make up the outer ear
auricle and external auditory canal
what 4 things make up the middle ear
tympanic membrane, 3 ear bones, eustachian tube, oval window
what is the tympanic membrane
ear drum
what are 3 ear bones called
malleus , incus, stapes
malleus
first ear bone, hammer
incus
2nd ear bone, anvil
stapes
3rd ear bone, stirrup
can the ear bones be replaced
yes
eustachian tube
connect middle ear to the throat/ maintains equal air pressure on both sides of the eardrum/ no connection to hearing
function of eustachian tube
maintains equal air pressure on both sides of the eardrum
is the eustachian tube connected to hearing
no
oval window
middle ear/opening which leads to the inner ear
what 3 things make up the inner ear
round window, cochlea, auditory nerve
round window
inner ear/ opening between middle and inner
cochlea
contains tiny hairs in fluid which responds to sound waves
what is equal to the cochlea in the ear
the retina
auditory nerve
connects to cochlea, sends sound messages to the brain
semicircular canal
important for balence/ equilibrium (fluid in them)
what is a condition that affects the semicircular canal
vertigo
vertigo
a sensation of dizziness
-drip w/ sweat, stress
is the semicircular canal involved with hearing
no
mechanical deafness
interference of sound vibrations to the inner ear
sensorineural deafness
damage to cochlea- affects nerves
tinnitis
ringing in the ear (hairs bent) if it keeps happening they wont regenerate
swimmers ear
bacterial infection (pool) pain and maybe pus
otitis media
2/3 by age of 2 have had it/ bacteria, viral- middle ear infection
what happens if you have too many ear infections
tubes get put in
what is the functions of tubes for otitis media
make fluid drip into blood stream
another name for nose
olfactory organ
where is the olfactory center
brain
smell
ability to detect chemicals as gases
where are the nerve receptors located in the nose
upper part of the nasal cavity
smell is related to ______
taste/ long lasting memory
if your nose smells a fire, what system is it connected to
danger- sympathetic NS (limbic- hypothalmus)
where are taste buds
on the tongue
taste center
brain
how many nerve cells for taste are there
10,000
what are the 4 primary taste sensations
sweet, sour, salty, bitter
how much of taste is from scent
80%
where are the 4 primary tastes located on the tongue
bitter- back
salty- left
sour- right
sweet- tip
what things affect your ability to taste
illness, smoking
where is the touch center
brain
touch receptors
light pressure
pressure receptors
heavy pressure
temperature receptors
hot and cold
pain receptors
lymbic
what are all the receptors in the skin
touch and pressure recpetors, temp receptors, pain recpetors
