11. Teeth, Mouth, Eyes, And Ears Flashcards
Malady
Illness or disorder of the body
3 parts of tooth:?
Crown, neck, root
Crown
Top part of tooth that rises above gum; covered by enamel
Enamel
Hardest substance in body
Neck
Connect crown and root
Root
Stabilizes tooth; covered by cementum
Cementum
Bone-like substance
___ hold onto cementum, fixing tooth firmly into jaw
Periodontal ligament
Inside the other is a layer of?
Dentin
Underneath dentin are blood vessels and nerves?
Pulp
Blood vessels supply tooth with?
Nutrients
Nerves
Help you sense activity on tooth surface; feel movement of tongue; helps you to talk
Most obvious sign of poor oral hygiene?
Cavities
Tooth decay
When plaque sits on surface of tooth
Plaque
Film-like substance formed from acid resulting from combination of food sugars and bacteria
Acid-like plaque eats away at surface of ____?
Crown; eventually reaching the pulp
Cause of periodontal disease?
Plaque
Periodontal disease destroys ___ that surrounds teeth and can cause?
Gums and ligaments; tooth loss
First sign of periodontal disease?
Inflation of gums
Halitosis
Medical term for bad breath
Outer part of eye consists of:?
The sclera, the cornea, the iris, and the pupil
Sclera
White outer part of eye
Cornea
Clear outer layer that functions as a lens
Iris
Colored part of eye
Pupil
Opening in center of iris
Pupil is controlled by ___ muscles of the ___ in its efforts to protect the eyes from ____
Involuntary; iris; light
Inside the eyeball:?
Crystalline lens, collars body, and the retina
Crystalline
Works with cornea to focus on an image
Ciliary body
Collection of muscles that enables lens to focus
Retina
Nerve tissue at back of eye; receives image that has been formed by cornea, pupil, and crystalline lens
Retina
Converts image into electrochemical signals and transmits them to brain
Eyeball rests in socket in?
Skull-orbit
Orbit
Line with fat that cushions eyeball
___ muscles control eye movement:?
6
Conjunctiva
Inner lining of eyelids, which contains glands that secrete oils and tears
Vitamin for eyes?
Vitamin A
Sunglasses protect the ____ from damage, which could lead to partial blindness
Retina
New and farsightedness is caused by?
Shape of eye; distance from cornea to retina
Outer ear consist of:?
Pinna and ear canal
Pinna
Made up skin and cartilage; receives sound waves
Ear canal
Channels sound captured by pinna to eardrum; 1 inch long
Ear canal is lined with tiny hairs that?
Protect middle ear and inner ear
___ separates outer ear from middle ear
Eardrum
Eardrum
Thin membrane that is sensitive to air pressure caused by sound
When the eardrum vibrates, it moves a set of muscles called?
Ossicles
Ossicles
Hammer, anvil, and stirrup; transmit sound waves from eardrum to inner ear
Inner ear
Most complex structure of ear; consist of cochlea and semicircular canals
Cochlea
Receives transfer of sound waves from ossicles and converts them into electrochemical impulses which are sent to brain
The cochlea is shaped like ____ and is lined with?
Snail; hair cells
Semicircle canals
Balance; contains fluid and hair cells that interpret changes in body’s position
