BIOD 152 Module 3 Exam Review | Anatomy
and Physiology 2 | Actual Q&A with Rationale
(BIOD152 Module 3 Exam Review) | Portage
Learning Online
BIOD 152 Module 3 Practice Exam
Anatomy and Physiology 2 | Portage Learning
Instructions: This practice exam contains 100 questions covering the special
senses and nervous system fundamentals. Each question includes the correct
answer and a detailed rationale. Bold italic text indicates key terms and concepts.
SECTION 1: The Eye — Anatomy and Function (Questions 1–25)
1. Which layer of the eye is responsible for providing blood supply to the retina?
• A) Sclera
• B) Choroid
• C) Cornea
• D) Retina
Answer: B) Choroid
Rationale: The choroid is the vascular, pigmented middle layer of the eye that
supplies oxygen and nutrients to the outer retina. The sclera is the tough outer
fibrous layer, the cornea is the transparent anterior portion, and the retina is the
inner neural layer.
,2. The transparent anterior portion of the fibrous layer of the eye is called the:
• A) Sclera
• B) Iris
• C) Cornea
• D) Lens
Answer: C) Cornea
Rationale: The cornea is the transparent, avascular anterior continuation of the
sclera. It is responsible for the majority of the eye's refractive power. The sclera is
the white, opaque portion of the fibrous layer.
3. Which photoreceptor cells are responsible for vision in dim light?
• A) Cones
• B) Rods
• C) Bipolar cells
• D) Ganglion cells
Answer: B) Rods
Rationale: Rods are extremely sensitive to light and function primarily in dim
lighting (scotopic vision). They do not provide sharp color vision. Cones require
bright light and are responsible for color and high-acuity vision.
4. A patient presents with blindness in the right visual field of both eyes. Where
is the most likely site of damage?
• A) Right optic nerve
• B) Left optic nerve
• C) Left lateral geniculate nucleus (LGN)
, • D) Right occipital lobe
Answer: C) Left lateral geniculate nucleus (LGN)
Rationale: Fibers from the right visual field of both eyes cross at the optic chiasm
and travel to the left LGN. Damage here would cause loss of the right visual field
in both eyes (contralateral homonymous hemianopia). Damage to one optic nerve
would cause blindness in that entire eye.
5. The blind spot (optic disc) is located where:
• A) The retina is thickest
• B) The optic nerve exits the eye
• C) Cones are most concentrated
• D) The fovea centralis is located
Answer: B) The optic nerve exits the eye
Rationale: The optic disc is the site where the optic nerve and blood vessels exit
the eyeball. It contains no photoreceptors, creating a natural blind spot. The fovea
centralis is the area of highest cone concentration and visual acuity.
6. Which muscle is responsible for constricting the pupil in bright light?
• A) Dilator pupillae
• B) Sphincter pupillae
• C) Ciliary muscle
• D) Superior rectus
Answer: B) Sphincter pupillae
Rationale: The sphincter pupillae (constrictor pupillae) is a circular smooth
muscle innervated by parasympathetic fibers. It contracts to constrict the pupil
, (miosis) in bright light. The dilator pupillae is controlled by sympathetic fibers and
dilates the pupil.
7. The gelatinous substance that fills the posterior segment of the eye is called:
• A) Aqueous humor
• B) Vitreous humor
• C) Endolymph
• D) Perilymph
Answer: B) Vitreous humor
Rationale: The vitreous humor is a clear, gel-like substance that fills the posterior
segment (behind the lens). It maintains the shape of the eyeball and transmits
light. Aqueous humor fills the anterior segment and is continuously produced and
drained.
8. Which of the following correctly describes the pathway of light through the
eye?
• A) Cornea → Lens → Pupil → Vitreous humor → Retina
• B) Cornea → Pupil → Lens → Vitreous humor → Retina
• C) Lens → Cornea → Pupil → Retina → Vitreous humor
• D) Pupil → Cornea → Lens → Retina → Vitreous humor
Answer: B) Cornea → Pupil → Lens → Vitreous humor → Retina
Rationale: Light enters through the cornea, passes through the pupil (regulated by
the iris), then through the lens for fine focusing, through the vitreous humor, and
finally strikes the retina where photoreceptors are located.
9. The ability of the eye to focus on near objects is called:
and Physiology 2 | Actual Q&A with Rationale
(BIOD152 Module 3 Exam Review) | Portage
Learning Online
BIOD 152 Module 3 Practice Exam
Anatomy and Physiology 2 | Portage Learning
Instructions: This practice exam contains 100 questions covering the special
senses and nervous system fundamentals. Each question includes the correct
answer and a detailed rationale. Bold italic text indicates key terms and concepts.
SECTION 1: The Eye — Anatomy and Function (Questions 1–25)
1. Which layer of the eye is responsible for providing blood supply to the retina?
• A) Sclera
• B) Choroid
• C) Cornea
• D) Retina
Answer: B) Choroid
Rationale: The choroid is the vascular, pigmented middle layer of the eye that
supplies oxygen and nutrients to the outer retina. The sclera is the tough outer
fibrous layer, the cornea is the transparent anterior portion, and the retina is the
inner neural layer.
,2. The transparent anterior portion of the fibrous layer of the eye is called the:
• A) Sclera
• B) Iris
• C) Cornea
• D) Lens
Answer: C) Cornea
Rationale: The cornea is the transparent, avascular anterior continuation of the
sclera. It is responsible for the majority of the eye's refractive power. The sclera is
the white, opaque portion of the fibrous layer.
3. Which photoreceptor cells are responsible for vision in dim light?
• A) Cones
• B) Rods
• C) Bipolar cells
• D) Ganglion cells
Answer: B) Rods
Rationale: Rods are extremely sensitive to light and function primarily in dim
lighting (scotopic vision). They do not provide sharp color vision. Cones require
bright light and are responsible for color and high-acuity vision.
4. A patient presents with blindness in the right visual field of both eyes. Where
is the most likely site of damage?
• A) Right optic nerve
• B) Left optic nerve
• C) Left lateral geniculate nucleus (LGN)
, • D) Right occipital lobe
Answer: C) Left lateral geniculate nucleus (LGN)
Rationale: Fibers from the right visual field of both eyes cross at the optic chiasm
and travel to the left LGN. Damage here would cause loss of the right visual field
in both eyes (contralateral homonymous hemianopia). Damage to one optic nerve
would cause blindness in that entire eye.
5. The blind spot (optic disc) is located where:
• A) The retina is thickest
• B) The optic nerve exits the eye
• C) Cones are most concentrated
• D) The fovea centralis is located
Answer: B) The optic nerve exits the eye
Rationale: The optic disc is the site where the optic nerve and blood vessels exit
the eyeball. It contains no photoreceptors, creating a natural blind spot. The fovea
centralis is the area of highest cone concentration and visual acuity.
6. Which muscle is responsible for constricting the pupil in bright light?
• A) Dilator pupillae
• B) Sphincter pupillae
• C) Ciliary muscle
• D) Superior rectus
Answer: B) Sphincter pupillae
Rationale: The sphincter pupillae (constrictor pupillae) is a circular smooth
muscle innervated by parasympathetic fibers. It contracts to constrict the pupil
, (miosis) in bright light. The dilator pupillae is controlled by sympathetic fibers and
dilates the pupil.
7. The gelatinous substance that fills the posterior segment of the eye is called:
• A) Aqueous humor
• B) Vitreous humor
• C) Endolymph
• D) Perilymph
Answer: B) Vitreous humor
Rationale: The vitreous humor is a clear, gel-like substance that fills the posterior
segment (behind the lens). It maintains the shape of the eyeball and transmits
light. Aqueous humor fills the anterior segment and is continuously produced and
drained.
8. Which of the following correctly describes the pathway of light through the
eye?
• A) Cornea → Lens → Pupil → Vitreous humor → Retina
• B) Cornea → Pupil → Lens → Vitreous humor → Retina
• C) Lens → Cornea → Pupil → Retina → Vitreous humor
• D) Pupil → Cornea → Lens → Retina → Vitreous humor
Answer: B) Cornea → Pupil → Lens → Vitreous humor → Retina
Rationale: Light enters through the cornea, passes through the pupil (regulated by
the iris), then through the lens for fine focusing, through the vitreous humor, and
finally strikes the retina where photoreceptors are located.
9. The ability of the eye to focus on near objects is called:
