anatomy and physiology unit 15
true
Erythrolabe pigment enables the eye to see redness.
false
In hyperopia, you can see close but not far.
Between media of different optical densities at an oblique angle
Light is refracted when it passes
true
Rhodopsin is a light-sensitive pigment
rod
Rhodopsin is found in ____ cells
true
Rods are more sensitive to light than cones, but cones are important for color vision.
true
Rods produce colorless vision.
lacrimal ducts
The ____ are the small channels in the eyelid that collect tears for drainage into the lacrimal sac.
hollow and spherical in shape
The eyeball itself is described as:
tears
The lacrimal apparatus is most associated with which bodily fluid?
true
The lacrimal apparatus produces and drains tears and keeps the eye moist and dustless.
ciliary body
The lens is held in place by the:
ciliary muscles contract
The lens of the eye thickens when the
protection
The main function of the sclera is best understood to be:
conjunctivitis
The medical term for "pink eye" is
Choroid coat, ciliary body, and iris
The middle tunic consists of the:
true
We perceive movement, distance and shapes by our sense of sight.
Proper cone functioning
a person who is colorblind lacks
6
How many main muscles of the extrinsic eye muscles are there?
farsightedness
Hyperopia is also known as:
fovea
The ____ is the part of the macula that produces sharper images.
optic disc
The ____ is where all the nerves of the retina converge together.
accommodation
The adjustment of the thickness of the lens to make close vision possible is called:
false
The ciliary body is responsible for controlling light intensity through the diameter and size of the pupil
red green and blue
The color receptors in the retina are most sensitive to light waves that are:
true
The conjunctiva is a layer of tissue that lines the inner surface of the eyelids and covers most of the anterior surface of the eye.
choroid coat
The most vascular portion of the eye is the
lateral rectus
The muscle that rotates the eye only laterally is the:
true
The optic disc features a blind spot
false
The retina is also known as the palpebra.
vitreous humor
The structure that fills the anterior of the eye and holds the retina flat against the choroid coat
cones and rods
The two visual receptors of the eye are called ____ and ____.
two rounded or curved sides
What does biconvex mean?
vitreous humor
What is the thick gel that fills the eye?
Levator palpebrae superioris
Which muscle is responsible for opening the eyelids?
nervous tissue
Which of the following is NOT one of the 4 main layers of the eyelid?
retina
Which of the following is part of the inner tunic of the eye?
optic disc
Which of the following structures are NOT in the anterior portion of the eye?
Eyelids Lacrimal apparatus Extrinsic eye muscles
Which of these is not a visual accessory organ of the eye:
choroid coat
Which of these structures of the eye is most vascular?