WGU D312 OBJECTIVE ASSESSMENT | EXAM QUESTIONS
AND ANSWERS | VERIFIED | LATEST UPDATE 2026/2027 |
GRADED A+ | GUARANTEED PASS!! WGU
What are the 3 layers constructing the wall of the eye?
fibrous, vascular, and neural
layer fibrous tunica fibrous,
outer coat vascular tunica
pigmented, vascular coat
What is the purpose of the blood and lymphatic vessels of
the Choroid? drain excess fluid from the posterior cavity
ciliary arteries
Arterial supply to the choroid Ciliary
body
the anterior portion of the choroid that sits behind the Iris, forming a
ring around the Lens.
The Ciliary body is composed of...
smooth muscle
Suspensory ligaments project from the ciliary body and attach it to
the lens
Functions of the Ciliary Body.
1) support the iris and lens,
2) adjust curvature of the lens
,3) secrete aqueous humor into the posterior chamber The iris
contains two rings of muscles the pupillary constrictor muscles
and the pupillary dilator muscles.
Function of the Iris
Change diameter of the aperture of the
pupil The lens
a curved structure in the eye that bends and focuses lightfor the
retina to see images clearly Neural Tunica the innermost, neural
layer.
The retina is attached to... the optic disc and the
ora serrata the Retina contains... photoreceptors
and associated neurons and fibers. macula lutea
the area of the retina that provides the clearest vision;
contains only cone photoreceptors fovea centralis the area of
the retina where vision is most accurate.
olfactory transduction
conversion of chemical molecules in the air into neural
impulses by the olfactory cilia local depolarization a locally
generated depolarization that causes an action potential
adaptation
the olfactory epithelium's sensitivity to smells over
time odor threshold
,lowest concentration of a certain odor compound that is perceivable
by the human sense of smell
In addition to tunicae, each eye consists
of... optical and neural structures. tunicae
Layers of the eye; there are 3
The posterior chamber is located between the the
iris, lens, suspensory ligaments, and the ciliary body
It is filled with aqueous humor and allows light to pass through it
The posterior chamber
The anterior chamber is located between the...
and is filled with... that allows light to pass
through cornea and iris aqueous humor neural
structures of the eye
retina and optic nerve process light
signals and relay them to the
brain retina
the inner lining of the posterior eye; consists of 10 layers of neural,
epithelial, and supporting cells.
two types of photoreceptor
cells rods and cones
Function of Aqueous Humor
, maintain intraocular pressure drain via the scleral venous sinus,
located at the junction of the cornea and sclera provide nutrients
to the avascular cornea and sclera.
optic disc or blind spot
the point from which ganglion cells from the retina leave the back of
the eye to form the optic nerve; no photoreceptors
Optic Nerve (Cranial Nerve II)
Nerve that carries impulses for sense of sight.
optic chiasm where
optic nerves cross
optical structures
Admit and refract light and focus images
-cornea
-pupil
-lens
-aqueous humor( anterior cavity b/w cornea + lens) -
vitreous humor (posterior cavity b/w lens+ retina)
Aqueous humor
clear, watery fluid that is filtered from blood capillaries in the
ciliary body and is constantly secreted suspensory ligaments hold
the lens in place
can change shape to accommodate viewing objects at closer or
further distances
The Lens
AND ANSWERS | VERIFIED | LATEST UPDATE 2026/2027 |
GRADED A+ | GUARANTEED PASS!! WGU
What are the 3 layers constructing the wall of the eye?
fibrous, vascular, and neural
layer fibrous tunica fibrous,
outer coat vascular tunica
pigmented, vascular coat
What is the purpose of the blood and lymphatic vessels of
the Choroid? drain excess fluid from the posterior cavity
ciliary arteries
Arterial supply to the choroid Ciliary
body
the anterior portion of the choroid that sits behind the Iris, forming a
ring around the Lens.
The Ciliary body is composed of...
smooth muscle
Suspensory ligaments project from the ciliary body and attach it to
the lens
Functions of the Ciliary Body.
1) support the iris and lens,
2) adjust curvature of the lens
,3) secrete aqueous humor into the posterior chamber The iris
contains two rings of muscles the pupillary constrictor muscles
and the pupillary dilator muscles.
Function of the Iris
Change diameter of the aperture of the
pupil The lens
a curved structure in the eye that bends and focuses lightfor the
retina to see images clearly Neural Tunica the innermost, neural
layer.
The retina is attached to... the optic disc and the
ora serrata the Retina contains... photoreceptors
and associated neurons and fibers. macula lutea
the area of the retina that provides the clearest vision;
contains only cone photoreceptors fovea centralis the area of
the retina where vision is most accurate.
olfactory transduction
conversion of chemical molecules in the air into neural
impulses by the olfactory cilia local depolarization a locally
generated depolarization that causes an action potential
adaptation
the olfactory epithelium's sensitivity to smells over
time odor threshold
,lowest concentration of a certain odor compound that is perceivable
by the human sense of smell
In addition to tunicae, each eye consists
of... optical and neural structures. tunicae
Layers of the eye; there are 3
The posterior chamber is located between the the
iris, lens, suspensory ligaments, and the ciliary body
It is filled with aqueous humor and allows light to pass through it
The posterior chamber
The anterior chamber is located between the...
and is filled with... that allows light to pass
through cornea and iris aqueous humor neural
structures of the eye
retina and optic nerve process light
signals and relay them to the
brain retina
the inner lining of the posterior eye; consists of 10 layers of neural,
epithelial, and supporting cells.
two types of photoreceptor
cells rods and cones
Function of Aqueous Humor
, maintain intraocular pressure drain via the scleral venous sinus,
located at the junction of the cornea and sclera provide nutrients
to the avascular cornea and sclera.
optic disc or blind spot
the point from which ganglion cells from the retina leave the back of
the eye to form the optic nerve; no photoreceptors
Optic Nerve (Cranial Nerve II)
Nerve that carries impulses for sense of sight.
optic chiasm where
optic nerves cross
optical structures
Admit and refract light and focus images
-cornea
-pupil
-lens
-aqueous humor( anterior cavity b/w cornea + lens) -
vitreous humor (posterior cavity b/w lens+ retina)
Aqueous humor
clear, watery fluid that is filtered from blood capillaries in the
ciliary body and is constantly secreted suspensory ligaments hold
the lens in place
can change shape to accommodate viewing objects at closer or
further distances
The Lens
