BIOL251 Human Anatomy & Physiology I w/Lab
2025 | Module 8 Exam Review |110+ Questions
and Answers Summary |LockDown Browser
|Portage Learning| Multiple Choice
Section 1: The Eye and Vision
1. Which structure regulates the amount of light entering the eye?
A) Cornea
B) Lens
C) Iris
D) Retina
Answer: C – The iris contains smooth muscle that contracts/dilates the pupil to control light
entry.
2. What is the correct order of structures light passes through?
A) Cornea → lens → aqueous humor → vitreous humor → retina
B) Cornea → aqueous humor → lens → vitreous humor → retina
C) Aqueous humor → cornea → lens → retina → vitreous humor
D) Lens → cornea → vitreous humor → retina
Answer: B – Light: cornea, aqueous humor (anterior chamber), lens, vitreous humor
(posterior segment), then retina.
3. Which photoreceptors are responsible for high-acuity color vision?
A) Rods
B) Cones
C) Bipolar cells
, D) Ganglion cells
Answer: B – Cones function in bright light and provide color vision; rods are for dim light and
grayscale.
4. Rhodopsin is found in:
A) Cones
B) Rods
C) Lens fibers
D) Pigment epithelium
Answer: B – Rhodopsin is the photopigment in rods, made of opsin and retinal.
5. Which cranial nerve carries visual information from the retina to the brain?
A) CN I
B) CN II
C) CN III
D) CN VI
Answer: B – CN II (optic nerve) transmits visual signals; CN III, IV, VI control eye movement.
6. The optic disc is known as the blind spot because:
A) No photoreceptors are present
B) It is covered by the lens
C) Light cannot penetrate the sclera
D) It contains only cones
Answer: A – Optic disc is where ganglion cell axons exit; lacks rods/cones.
7. Which eye structure changes shape to focus on near objects?
A) Cornea
B) Iris
C) Lens
D) Ciliary body
Answer: C – Lens accommodation via ciliary muscle contraction relaxes zonular fibers, lens
becomes more convex.
8. Presbyopia is caused by:
A) Elongated eyeball
2025 | Module 8 Exam Review |110+ Questions
and Answers Summary |LockDown Browser
|Portage Learning| Multiple Choice
Section 1: The Eye and Vision
1. Which structure regulates the amount of light entering the eye?
A) Cornea
B) Lens
C) Iris
D) Retina
Answer: C – The iris contains smooth muscle that contracts/dilates the pupil to control light
entry.
2. What is the correct order of structures light passes through?
A) Cornea → lens → aqueous humor → vitreous humor → retina
B) Cornea → aqueous humor → lens → vitreous humor → retina
C) Aqueous humor → cornea → lens → retina → vitreous humor
D) Lens → cornea → vitreous humor → retina
Answer: B – Light: cornea, aqueous humor (anterior chamber), lens, vitreous humor
(posterior segment), then retina.
3. Which photoreceptors are responsible for high-acuity color vision?
A) Rods
B) Cones
C) Bipolar cells
, D) Ganglion cells
Answer: B – Cones function in bright light and provide color vision; rods are for dim light and
grayscale.
4. Rhodopsin is found in:
A) Cones
B) Rods
C) Lens fibers
D) Pigment epithelium
Answer: B – Rhodopsin is the photopigment in rods, made of opsin and retinal.
5. Which cranial nerve carries visual information from the retina to the brain?
A) CN I
B) CN II
C) CN III
D) CN VI
Answer: B – CN II (optic nerve) transmits visual signals; CN III, IV, VI control eye movement.
6. The optic disc is known as the blind spot because:
A) No photoreceptors are present
B) It is covered by the lens
C) Light cannot penetrate the sclera
D) It contains only cones
Answer: A – Optic disc is where ganglion cell axons exit; lacks rods/cones.
7. Which eye structure changes shape to focus on near objects?
A) Cornea
B) Iris
C) Lens
D) Ciliary body
Answer: C – Lens accommodation via ciliary muscle contraction relaxes zonular fibers, lens
becomes more convex.
8. Presbyopia is caused by:
A) Elongated eyeball
