BIOL251 Human Anatomy & Physiology I w/Lab 2026 | Module 8 Exam Review |70+ Questions and Answers Summary |LockDown Browser |Portage Learning

BIOL 251: Human Anatomy & Physiology I w/Lab 2026 - 2027
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Module 8: The Special Senses
Complete Exam Review Questions with Verified Answers |
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Question 1
The sclera continues anteriorly as which transparent structure?
A) Retina
B) Cornea
C) Lens
D) Iris
Correct Answer: B) Cornea
Explanation: The sclera (white of the eye) continues anteriorly as
the cornea, which is the transparent, curved structure at the front
of the eye. The cornea is avascular and receives nutrients from
tears and aqueous humor. It is responsible for the majority of the
eye's focusing power (refraction). The retina is the inner layer that
detects light. The lens focuses light onto the retina. The iris is the
colored part of the eye that controls pupil size.

,Question 2
Which structure, found in the posterior segment, helps maintain the shape
of the eye?
A) Canal of Schlemm
B) Cornea
C) Aqueous humor
D) Vitreous humor
Correct Answer: D) Vitreous humor
Explanation: The vitreous humor is a gelatinous substance found in
the posterior segment of the eye that helps maintain the shape of
the eye and keeps the retina pressed against the choroid. It is a
transparent gel composed primarily of water and hyaluronic acid.
Aqueous humor is found in the anterior segment and provides
nutrients to the cornea and lens. The canal of Schlemm drains
aqueous humor. The cornea is the transparent outer layer.


Question 3
Identify the eye structure denoted by the letter B (Palpebral fissure).
A) The opening between the eyelids
B) The colored part of the eye
C) The white part of the eye
D) The pink bump at the inner corner of the eye
Correct Answer: A) The opening between the eyelids

,Explanation: The palpebral fissure is the opening between the upper
and lower eyelids. It allows light to enter the eye and protects the
eyeball. The iris is the colored part of the eye. The sclera is the
white part of the eye. The lacrimal caruncle is the pink bump at the
inner corner of the eye. The palpebral fissure is an important
anatomical landmark for assessing eye position and function.


Question 4
Identify the eye structure denoted by the letter D (Iris).
A) The opening between the eyelids
B) The colored part of the eye
C) The white part of the eye
D) The pink bump at the inner corner of the eye
Correct Answer: B) The colored part of the eye
Explanation: The iris is the colored part of the eye, located between
the cornea and the lens. It contains muscles that control the size of
the pupil, regulating the amount of light entering the eye. The iris
contains melanin, which determines eye color (brown, blue, green,
etc.). The palpebral fissure is the opening between the eyelids. The
sclera is the white part. The lacrimal caruncle is the pink bump at
the inner corner.

, Question 5
Identify the eye structure denoted by the letter J (Lacrimal caruncle).
A) The opening between the eyelids
B) The colored part of the eye
C) The white part of the eye
D) The pink bump at the inner corner of the eye
Correct Answer: D) The pink bump at the inner corner of the eye
Explanation: The lacrimal caruncle is the small, pink bump located at
the medial corner (inner canthus) of the eye. It contains sebaceous
and sweat glands that contribute to the eye's tear film. The
palpebral fissure is the opening between the eyelids. The iris is the
colored part of the eye. The sclera is the white part. The lacrimal
caruncle is often visible when looking at the inner corner of the eye.


Question 6
Identify the eye structure denoted by the letter B (Superior oblique
muscle).
A) A muscle that elevates the eye
B) A muscle that depresses and intorts the eye
C) A muscle that abducts the eye
D) A muscle that adducts the eye
Correct Answer: B) A muscle that depresses and intorts the eye