Ch. 15 Flashcards
What are the three layers of the human eye?
Sclera, Choroid, and Retina
The white fibrous outer layer of the eyeball is the …?
sclera
The transparent portion of the outer eye that allows light to enter the eye is the …?
cornea
The middle coat of the eye that absorbs stray light is called the …?
choroid
The three layers, or coats, of the human eye are the choroid, the sclera, and the …?
retina
The part of the eye that controls the size of the pupil is the ….?
iris
The clear portion of the anterior portion of the outer layer of the eye is called the …?
cornea
The shape of the lens changes for near or far vision due to the action of the …?
ciliary body
The middle layer of the eye with a dark pigment to absorb stray light is the ______?
choroid
The eye structure that changes shape in order to focus an image on the retina is the …?
lens
When someone refers to blue eyes, they are specifically referring to the color of the …?
iris
The opening in the front of the eye that is surrounded by the iris and through which light passes is the …?
pupil
When drainage ducts of the anterior compartment are blocked, and aqueous humor builds up the condition is known as …?
glaucoma
The structure of the eye responsible for changing the shape of the lens is the …?
ciliary body
What structure divides the eye into anterior and posterior compartments?
lens
Glasses are often needed after age 40 because ?
the lens is less elastic
The protein opsin and the molecule retinal combine to form the pigment found in rods called …?
rhodopsin
Visual accommodation occurs when …?
the lens changes shape for close vision
How many different types of cone cells are present in the normal human retina?
3
The area where the optic nerves cross after leaving the eyes is the …?
optic chiasma
The visual condition that may result from an unevenly shaped cornea is called …?
astigmatism
Clouding of the lens of the eye causes a(n) …?
cataract
Stereocilia are long, stiff, microvilli that are present on the hair cells of the …?
inner ear
The three small bones (malleus, incus, and stapes) that transmit vibrations across the middle ear are collectively called the …?
ossicles
The tympanic membrane is commonly called the …?
eardrum
Within the cochlea, the hair cells of the spiral organ have stereocilia that are embedded in the …?
tectorial membrane
The inner ear structure that is especially sensitive to detecting back and forth movement of the head is the …?
utricle
Gravitational equilibrium requires the movement of small particles of calcium carbonate called …?
otoliths
The structures that function for gravitation equilibrium are the …?
saccule and utricle
The receptors involved with detecting when the head moves in a vertical or horizontal direction are used for _____ equilibrium.
gravitational
A calcium carbonate granule associated with sensory receptors for detecting head movement in vertebrates is called a(n) …?
otolith
