Health Vocab Chapter 18
Terms
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- outermost layer of skin
- Epidermis
- helps determine the color of your skin, more melanin=darker skin
- Melanin
- tough and elastic layer of skin below the epidermis
- Dermis
- the opening of a narrow channel that leads to a gland
- Pore
- produces oil
- Sebaceous Gland
- condition in which the oil glands become blocked, infected, and swollen
- Acne
- a physician who deals with skin disorders
- Dermatologist
- a condition in which an area of skin becomes red, swollen, hot, and itchy
- Dermatitis
- a virus that causes clusters of watery blisters or cold sores
- Herpes Simplex I
- an area of uncontrolled cell growth that invades the surrounding tissue and destroys it
- Cancer
- the most serious form of skin cancer
- Melanoma
- white of the eye
- Sclera
- the nerve that transmits visual information to the brain
- Optic Nerve
- allows light to enter into the eyes
- Cornea
- thin, moist membrane that covers the front part of the sclera and the inside of the eyelid
- Conjunctiva
- dark colored membrane that makes up most o the middle layer of the eye
- Choroid
- gives the eye its color
- Iris
- opening in the iris that allows light to pass through the cornea into the interior of the eye
- Pupil
- lies behind the iris and is a transparent structure that focuses light on the inner, back side of the eye
- Lens
- the light-sensing part of the eye
- Retina
- respond to dim light and allow you to see black, white, and gray
- Rods
- stimulated by bright light and enable you to see color
- Cones
- process by which your eyes see and your brain interprets images
- Stereoscopic Vision
- the ability to see things to the side of the object you are looking at
- Peripheral Vision
- the ability to see nearby objects clearly but not far away objects
- Nearsightedness
- the ability to see far away objects clearly but not nearby objects
- Farsightedness
- distorted vision caused by irregular curvature of the cornea or lens
- Astigmatism
- inability to distinguish certain colors
- Color Blindness
- a condition caused by the pressure of fluid between the cornea and lens
- Glaucoma
- clouding of the eye’s lens
- Cataract
- a red, painful swelling at the base of an eyelash gland
- Sty
- an inflammation o the conjunctiva
- Conjunctivitis
- a narrow cavity that leads to the middle ear
- Ear Canal
- vibrates when sound waves strike it, at the end o the ear canal
- Eardrum
- connects the middle ear with the back of the throat
- Eustachian Tube
- separates the middle ear from the inner ear
- Oval Window
- a hollow, coiled tube that is filled with fluid
- Cochlea
- nerve through which impulses travel to the brain where they are interpreted as sound
- Auditory Nerve
- main inner-ear structures that help give you a sense of balance
- Semicircular Canals
- refers to a partial loss of hearing
- Hearing Impairment
- total inability to hear
- Deafness
- units of intensity or loudness of sound
- Decibels
- a specialized ear doctor
- Audiologist