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9 - Vision Warmup

Terms in this set (37)

A subset of non-visual photoreceptive ganglion cells in the retina is unusual in that the cells do not function in vision, but rather in the
-establishment of 24 hour down/dusk rhythms
-regulation of androgen levels
-none
-determination of eye color
-establishment of 24 hour down/dusk rhythms
which of these is true?
-the optic disk has >1,000,000 cone cells
-cone cells are less sensitive than rods to a broad spectrum of wavelengths
-cone cells are absent from the fovea
-cone cells have several types of visual pigments
cone cells have several types of visual pigments
The sclera is continuous anteriorly with the transparent region called the
-retina
-lens
-limbus
-cornea
cornea
Which of these is true of the corneal epithelium?
-it is densely supplied w/ free nerve endings that trigger the blink reflex
-an endothelium lines the posterior surface of the cornea
-it is a 5-6 cells thick
-all
all
In addition to the loss of visual acuity, one of the dangers of a detached retina is that
-It cannot receive needed metabolic support from the pigmented layer and the choroid, and so the retinal cells will die eventually.
-it inhibits the production of aqueous humor
-It may block light from entering through the pupil.
-it will lead to the degeneration of the optic nerve
It may block light from entering through the pupil.
which is true?
-The dilator papillae has sympathetic innervation for enlarging the pupil.
-The dilator papillae has parasympathetic innervation for constricting the pupil.
-The dilator papillae has sympathetic innervation for constricting the pupil.
-The dilator papillae has parasympathetic innervation for enlarging the pupil.
the dilator papillae has sympathetic innervation for enlarging the pupil
The ________________ has melanocytes that block light from penetrating the eye except through the pupil.
-iris
-ciliary body
-sclera
-choroid
choroid
which of these is not a part of the eyelid?
-conjunctiva
-large sebaceous glands
-ciliary muscles
-hair follicles
ciliary muscles
Which of these is not part of the eyelid?
(conjunctiva, large sebaceous glands, ciliary muscles, hair follicles)
ciliary muscles
Vision is the sharpest in the fovea region of the retina. Why?
-all
-The cell bodies of the ganglion cells are peripheral to the fovea
-The cone cells are abundant and tightly packed.
-Very few capillaries are present in the fovea.
all
how many cone cells are in the human retina?
-46,0000,000
-46,000
-4,6000,000
-460,000
4,6000,000
How many rod cells are in the human retina?
-920,000,000
-4,600,000
-46,000
-92,000,000
92,000,000
The general name for visual pigments found in cones is called
(iodopsin, melanopsin, rhodopsin, all)
lodopsin
Which of these is true of lacrimal glands?
-all
-lacrimal glands are different than tarsal glands
-tear from the lacrimal glands glands pass into the nasal passages by way of the nasolacrimal duct
-lacrimal glands are serous tubuloacinar glands
-all
what's true?
-(When the ciliary muscles are relaxed, the lens is flatter, and nearby objects are in focus)
-(When the ciliary muscles are relaxed, the lens is more rounded, and distant objects are in focus0
-(When the ciliary muscles are relaxed, the lens is flatter, and distant objects are in focus)
-(When the ciliary muscles are contracted, the lens is flatter, and distant objects are in focus)
-(When the ciliary muscles are relaxed, the lens is flatter, and distant objects are in focus)
Which of these is not true of the lens?
(all, it is vascularized, it is elastic, it is derived from embryonic surface ectoderm)
it is vascularized
The "blind spot" is also known as the
-optic disc
-fovea
-macula
-hyaloid canal
optic disc
the white of your eye
sclera
inflammation of this is called pink eye
conjunctiva
this fills the anterior chamber
aqueous humor
this fills the posterior chamber
aqueous humor
the transparent region that is continuous w/ the sclera
cornea
name for increase in intraocular pressure
glaucoma
the type of fibers that form the sclera
type I collagen
the eyelid contains a series of sebaceous glands known as
(tarsal glands, none, lacrimal, tear glands)
tarsal glands
visual accomodation in in humans is accomplished by
(changing the shape of the lens)
(dilating the pupil)
(moving the lens forward or backward)
changing the shape of the lens
which is true?
-the dilator papillae muscle functions in opening the puil
-the dilator papillae muscle functions in accommodation
-the smooth muscles that are used for focusing are part of the iris
-the constrictor pupillae muscle is part of the ciliary body
-the dilator papillae muscle functions in opening the pupil
the optic "nerve" is not really a nerve. why?
-it contains no synapses
-contains arteries & veins
-has no motor fibers
-formed from part of the brain, is a tract
because it formed from part of the brain, not from the PNS, and is therefore a tract
Which of these is a cause of red-green color blindness?
-Defects in red or green cones; there are different causes for red-green color blindness.
-Defects in red cones only; this causes one to be unable to distinguish red and green
-defects in rods
-defects in green only
Defects in red or green cones; there are different causes for red-green color blindness.
Which of these is characteristics indicates that the retina is derived from the central nervous system?
-presence of glial cells
-absences of ganglia
-presence of photoreceptors
-presence of glial cells
-presence of dendrites
-presence of glial cells
visual pigment found in rods is
-rhodopsin
-iodopsin
-none
-melanopsin
rhodopsin
which is true?
-rods have rhodopsin as the visual pigment
-cones have 3 types of iodopsin visual pigments
-visual pigments are proteins that change their shape due to a reaction w/ photons
-all
all
the channel that drains the aqueous humor from the anterior chamber is the
-pupil
-ciliary body
-hyaloid canal
-canal of schlemm
canal of schlemm
The parts of the vascular layer of the eye are
choroid, ciliary body, & iris
eye color is determined by the density of
-melanocytes
-crystallin
-myoepithelial cells
-rhodopsins
melanocytes
what structure attaches the lens to the ciliary body?
-choroid
-extrocular muscles
-zonular fibers
-sphincter pupillae
zonular fibers
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