BIOL 252 Human Anatomy & Physiology II w/Lab |
Module 3 Exam
150 Multiple Choice Questions with Bold Italic
Answers and Explanations 2026/2027|100%
Correct Verified Answers |A+ Graded
1. The sense that does NOT have specialized sense organs is:
A) Smell
B) Touch
C) Equilibrium
D) A & C
B) Touch
Touch is a general sense, meaning its receptors are distributed throughout the
body rather than concentrated in a specialized organ like the eye or ear. It is often
considered part of the somatic sensory system rather than a special sense .
2. The posterior portion of the outer fibrous layer of the eye is called the:
A) Cornea
B) Sclera
C) Choroid
D) Retina
The outer layer of the eye consists of the cornea (anterior, transparent) and the
sclera (posterior, white fibrous tissue). The sclera provides structural support and
protection for the eye .
3. Which portion of the eye supplies blood supply to the other layers of the eye?
,A) Sclera
B) Retina
C) Choroid
D) Cornea
The choroid is a highly vascular layer of the eye located between the sclera and
retina. It provides oxygen and nutrients to the retinal pigment epithelium and
photoreceptors .
4. The more numerous type of photoreceptors are:
A) Rods
B) Cones
C) Bipolar cells
D) Ganglion cells
Rods are far more numerous than cones, with approximately 120 million rods
compared to 6 million cones. Rods are responsible for vision in dim light and do
not detect color .
5. True or False: Cones operate best in dim light.
A) True
B) False
This statement is false. Cones require bright light for activation and are
responsible for color vision and high visual acuity. Rods operate best in dim light .
6. What is the correct order of how light passes through the eye?
A) Cornea, Lens, pupil, retina
B) Cornea, lens, vitreous fluid, retina
C) Lens, retina, cornea, optic nerve
D) Lens, vitreous fluid, optic nerve, retina
,Light enters the eye through the cornea, passes through the pupil (regulated by
the iris), then through the lens, through the vitreous fluid, and finally focuses on
the retina .
7. Vitreous fluid fills which space in the eye?
A) Anterior chamber
B) Posterior chamber (posterior to the lens)
C) Aqueous humor space
D) Subretinal space
The vitreous fluid (vitreous humor) is a clear, gel-like substance that fills the
posterior chamber of the eye, the space behind the lens. It helps maintain the
shape of the eye .
8. The ________ is controlled by the trochlear nerve (CN IV).
A) Superior rectus
B) Medial rectus
C) Lateral rectus
D) Superior oblique
The trochlear nerve (CN IV) innervates the superior oblique muscle, which is
responsible for depressing and rotating the eye inward. The abducens nerve
controls the lateral rectus, and the oculomotor nerve controls the other
extraocular muscles .
9. The ________ is controlled by the abducens nerve (CN VI).
A) Superior rectus
B) Medial rectus
C) Lateral rectus
D) Superior oblique
, The abducens nerve (CN VI) innervates the lateral rectus muscle. Contraction of
this muscle abducts the eye (moves it laterally). Damage to this nerve causes
medial deviation of the eye at rest .
10. Your elderly patient has blurry vision, and her left eye deviates medially
when looking straight ahead. What is most likely causing the problem?
A) Cataracts
B) Abducens nerve damage
C) Brain tumor in the occipital lobe
D) Medial rectus damage
Damage to the abducens nerve (CN VI) causes paralysis of the lateral rectus
muscle. The unopposed pull of the medial rectus causes the eye to deviate
medially (esotropia). This imbalance leads to diplopia and blurry vision .
11. Damage to the left optic nerve causes:
A) Bilateral left visual field blindness
B) Bilateral right visual field blindness
C) Left eye blindness
D) Right eye blindness
Damage to the left optic nerve occurs before the optic chiasm. Since information
from the left eye has not yet crossed to the right side, the entire left eye's visual
field (both nasal and peripheral) would be lost .
12. Damage to the right optic tract causes:
A) Left eye blindness
B) Bilateral left visual field blindness
C) Right eye blindness
D) Bilateral right visual field blindness
Module 3 Exam
150 Multiple Choice Questions with Bold Italic
Answers and Explanations 2026/2027|100%
Correct Verified Answers |A+ Graded
1. The sense that does NOT have specialized sense organs is:
A) Smell
B) Touch
C) Equilibrium
D) A & C
B) Touch
Touch is a general sense, meaning its receptors are distributed throughout the
body rather than concentrated in a specialized organ like the eye or ear. It is often
considered part of the somatic sensory system rather than a special sense .
2. The posterior portion of the outer fibrous layer of the eye is called the:
A) Cornea
B) Sclera
C) Choroid
D) Retina
The outer layer of the eye consists of the cornea (anterior, transparent) and the
sclera (posterior, white fibrous tissue). The sclera provides structural support and
protection for the eye .
3. Which portion of the eye supplies blood supply to the other layers of the eye?
,A) Sclera
B) Retina
C) Choroid
D) Cornea
The choroid is a highly vascular layer of the eye located between the sclera and
retina. It provides oxygen and nutrients to the retinal pigment epithelium and
photoreceptors .
4. The more numerous type of photoreceptors are:
A) Rods
B) Cones
C) Bipolar cells
D) Ganglion cells
Rods are far more numerous than cones, with approximately 120 million rods
compared to 6 million cones. Rods are responsible for vision in dim light and do
not detect color .
5. True or False: Cones operate best in dim light.
A) True
B) False
This statement is false. Cones require bright light for activation and are
responsible for color vision and high visual acuity. Rods operate best in dim light .
6. What is the correct order of how light passes through the eye?
A) Cornea, Lens, pupil, retina
B) Cornea, lens, vitreous fluid, retina
C) Lens, retina, cornea, optic nerve
D) Lens, vitreous fluid, optic nerve, retina
,Light enters the eye through the cornea, passes through the pupil (regulated by
the iris), then through the lens, through the vitreous fluid, and finally focuses on
the retina .
7. Vitreous fluid fills which space in the eye?
A) Anterior chamber
B) Posterior chamber (posterior to the lens)
C) Aqueous humor space
D) Subretinal space
The vitreous fluid (vitreous humor) is a clear, gel-like substance that fills the
posterior chamber of the eye, the space behind the lens. It helps maintain the
shape of the eye .
8. The ________ is controlled by the trochlear nerve (CN IV).
A) Superior rectus
B) Medial rectus
C) Lateral rectus
D) Superior oblique
The trochlear nerve (CN IV) innervates the superior oblique muscle, which is
responsible for depressing and rotating the eye inward. The abducens nerve
controls the lateral rectus, and the oculomotor nerve controls the other
extraocular muscles .
9. The ________ is controlled by the abducens nerve (CN VI).
A) Superior rectus
B) Medial rectus
C) Lateral rectus
D) Superior oblique
, The abducens nerve (CN VI) innervates the lateral rectus muscle. Contraction of
this muscle abducts the eye (moves it laterally). Damage to this nerve causes
medial deviation of the eye at rest .
10. Your elderly patient has blurry vision, and her left eye deviates medially
when looking straight ahead. What is most likely causing the problem?
A) Cataracts
B) Abducens nerve damage
C) Brain tumor in the occipital lobe
D) Medial rectus damage
Damage to the abducens nerve (CN VI) causes paralysis of the lateral rectus
muscle. The unopposed pull of the medial rectus causes the eye to deviate
medially (esotropia). This imbalance leads to diplopia and blurry vision .
11. Damage to the left optic nerve causes:
A) Bilateral left visual field blindness
B) Bilateral right visual field blindness
C) Left eye blindness
D) Right eye blindness
Damage to the left optic nerve occurs before the optic chiasm. Since information
from the left eye has not yet crossed to the right side, the entire left eye's visual
field (both nasal and peripheral) would be lost .
12. Damage to the right optic tract causes:
A) Left eye blindness
B) Bilateral left visual field blindness
C) Right eye blindness
D) Bilateral right visual field blindness
