Ch. 15

Question 1

What are the three layers of the human eye?

Answer 1

Sclera, Choroid, and Retina

Question 2

The white fibrous outer layer of the eyeball is the …?

Answer 2

sclera

Question 3

The transparent portion of the outer eye that allows light to enter the eye is the …?

Answer 3

cornea

Question 4

The middle coat of the eye that absorbs stray light is called the …?

Answer 4

choroid

Question 5

The three layers, or coats, of the human eye are the choroid, the sclera, and the …?

Answer 5

retina

Question 6

The part of the eye that controls the size of the pupil is the ….?

Answer 6

iris

Question 7

The clear portion of the anterior portion of the outer layer of the eye is called the …?

Answer 7

cornea

Question 8

The shape of the lens changes for near or far vision due to the action of the …?

Answer 8

ciliary body

Question 9

The middle layer of the eye with a dark pigment to absorb stray light is the ______?

Answer 9

choroid

Question 10

The eye structure that changes shape in order to focus an image on the retina is the …?

Answer 10

lens

Question 11

When someone refers to blue eyes, they are specifically referring to the color of the …?

Answer 11

iris

Question 12

The opening in the front of the eye that is surrounded by the iris and through which light passes is the …?

Answer 12

pupil

Question 13

When drainage ducts of the anterior compartment are blocked, and aqueous humor builds up the condition is known as …?

Answer 13

glaucoma

Question 14

The structure of the eye responsible for changing the shape of the lens is the …?

Answer 14

ciliary body

Question 15

What structure divides the eye into anterior and posterior compartments?

Answer 15

lens

Question 16

Glasses are often needed after age 40 because ?

Answer 16

the lens is less elastic

Question 17

The protein opsin and the molecule retinal combine to form the pigment found in rods called …?

Answer 17

rhodopsin

Question 18

Visual accommodation occurs when …?

Answer 18

the lens changes shape for close vision

Question 19

How many different types of cone cells are present in the normal human retina?

Answer 19

3

Question 20

The area where the optic nerves cross after leaving the eyes is the …?

Answer 20

optic chiasma

Question 21

The visual condition that may result from an unevenly shaped cornea is called …?

Answer 21

astigmatism

Question 22

Clouding of the lens of the eye causes a(n) …?

Answer 22

cataract

Question 23

Stereocilia are long, stiff, microvilli that are present on the hair cells of the …?

Answer 23

inner ear

Question 24

The three small bones (malleus, incus, and stapes) that transmit vibrations across the middle ear are collectively called the …?

Answer 24

ossicles

Question 25

The tympanic membrane is commonly called the ...?

Answer 25

eardrum

Question 26

Within the cochlea, the hair cells of the spiral organ have stereocilia that are embedded in the ...?

Answer 26

tectorial membrane

Question 27

The inner ear structure that is especially sensitive to detecting back and forth movement of the head is the ...?

Answer 27

utricle

Question 28

Gravitational equilibrium requires the movement of small particles of calcium carbonate called ...?

Answer 28

otoliths

Question 29

The structures that function for gravitation equilibrium are the ...?

Answer 29

saccule and utricle

Question 30

The receptors involved with detecting when the head moves in a vertical or horizontal direction are used for _____ equilibrium.

Answer 30

gravitational

Question 31

A calcium carbonate granule associated with sensory receptors for detecting head movement in vertebrates is called a(n) ...?

Answer 31

otolith