Chapter 14 Health

a disorder in which a person stops breathing for short periods during sleep and then suddenly resumes breathing

• Cochlea

• semicircular canals

• sleep apnea

• optometrist

the opening in the center of the eye through which light enters

• pulp

• pore

• keratin

• pupil

hardened plaque that irritates the gums

• keratin

• retina

• tartar

• cornea

material that covers the tooth's root and helps anchor the tooth to the jawbone

• cementum

• keratin

• eardrum

• optometrist

the tough, elastic layer of skin that lies below the epidermis; contains nerves, blood vessels and sweat glands

• nails

• epidermis

• dermis

• dentin

the clear tissue that covers the front of the eye

• tartar

• retina

• pore

• cornea

a disorder in which a person experiences severe sleepiness during the day, or falls asleep suddenly

• sleep apnea

• narcolepsy

• cochlea

• optometrist

a protein in dead skin cells that make the skin tough and waterproof

• eardrum

• melanin

• dentin

• keratin

the body's internal system for regulating behavior patterns during a 24-hour cycle

• malocclusion

• narcolepsy

• circadian rhythm

• optometrist

a skin problem that occurs when excess oil and dead cells block a hair follicle

• eczema

• pore

• plaque

• acne