A&P 1 101 Module 6 Lab Exam | Portage Learning Special Senses & Endocrine System
A&P 1 101 Module 6 Lab Exam — Questions and
Answers
Portage Learning • Special Senses & Endocrine System
Anatomy & Physiology I — Module 6 Lab Examination
45 Questions • Cognitive Mix: 30% Recall / 45% Application / 25% Analysis
Format: 60% Scenario/Labeling/Essay-Based • 25% Direct Recall • 15% Matching
This 45-question Portage Learning A&P 1 101 Module 6 Lab examination comprehensively assesses
the special senses (eye, ear, sensory receptors) and the endocrine system across six content domains:
(1) eye anatomy and vision, (2) ear anatomy and hearing/balance, (3) sensory receptors and
pathways, (4) endocrine system overview, (5) major endocrine glands and their hormones, and (6)
clinical applications and integrated scenarios. Each question is anchored to specific Portage
Learning Module 6 lab objectives and includes a detailed rationale explaining the anatomical
structures, physiological processes, hormonal regulation, and clinical reasoning required to select
the correct answer. The exam emphasizes scenario-based clinical application, anatomical labeling,
hormone identification, receptor classification, and the integration of structure with function —
including visual and auditory pathways, endocrine feedback loops, hormone-cell pairings, and the
pathophysiology of common endocrine and sensory disorders.
Section 1: Special Senses — Eye Anatomy and Vision
Q1: During an eye dissection lab, a student identifies three distinct layers of the eyeball.
Which of the following correctly lists the three tunics of the eye from outermost to
innermost, along with their primary components?
A. Retinal tunic (retina); Vascular tunic (choroid, ciliary body, iris); Fibrous tunic (sclera,
cornea)
B. Fibrous tunic (sclera, cornea); Vascular tunic (choroid, ciliary body, iris); Nervous tunic
(retina) [CORRECT]
C. Nervous tunic (retina); Fibrous tunic (sclera, cornea); Vascular tunic (choroid, ciliary body)
D. Vascular tunic (choroid only); Nervous tunic (retina, iris); Fibrous tunic (sclera, lens)
Correct Answer: B
Rationale: The eyeball wall is composed of three concentric tunics. The outermost fibrous tunic
consists of the sclera (white, opaque, protective) and the cornea (transparent, anterior, refracts light).
The middle vascular tunic (uvea) consists of the choroid (highly vascular, nourishes retina and
absorbs stray light), ciliary body (contains ciliary muscles that control lens shape and secretes aqueous
humor), and iris (colored portion with pupil that regulates light entry). The innermost nervous tunic is
the retina, which contains the photoreceptors (rods and cones) and the neurons of the visual pathway.
Choice A reverses the order. Choice C also reverses the order. Choice D misplaces the iris (which is
part of the vascular tunic, not the nervous tunic) and incorrectly lists the lens (which is not part of any
tunic).
Page 1 | Portage Learning — A&P 1 Module 6 Lab Exam
,A&P 1 101 Module 6 Lab Exam | Portage Learning Special Senses & Endocrine System
Q2: A patient presents with a corneal abrasion after scratching their eye. The physician
notes that the cornea is avascular. Which tunic of the eye contains the cornea, and how does
the cornea receive oxygen and nutrients despite being avascular?
A. Vascular tunic; receives nutrients from the choroid blood vessels
B. Fibrous tunic; receives oxygen and nutrients from the aqueous humor and tear film
[CORRECT]
C. Nervous tunic; receives nutrients from the retinal blood supply
D. Fibrous tunic; receives nutrients exclusively from the vitreous humor
Correct Answer: B
Rationale: The cornea is part of the fibrous tunic (the outermost layer of the eye, along with the
sclera). Although the sclera has some blood vessels, the cornea is avascular — it lacks blood vessels —
to maintain its transparency, which is essential for vision. The cornea receives oxygen primarily by
diffusion from the air (via the tear film) and nutrients from the aqueous humor that fills the anterior
chamber behind it. The lacrimal (tear) fluid also contributes to oxygen supply and nourishment.
Choice A incorrectly places the cornea in the vascular tunic. Choice C incorrectly places it in the
nervous tunic. Choice D is incorrect because the vitreous humor is in the posterior cavity, behind the
lens, and does not bathe the cornea. Corneal avascularity is also why corneal transplants typically do
not require tissue matching.
Q3: An ophthalmologist examines a patient's eye and observes the colored portion that
determines whether the patient has brown, blue, or green eyes. Which structure is being
observed, what tunic does it belong to, and what is its functional role?
A. Pupil; nervous tunic; controls the amount of light entering
B. Iris; vascular tunic; regulates pupil size and the amount of light entering the eye
[CORRECT]
C. Cornea; fibrous tunic; refracts light entering the eye
D. Choroid; vascular tunic; absorbs stray light within the eye
Correct Answer: B
Rationale: The iris is the colored, visible portion of the eye that determines eye color (brown, blue,
green, hazel). It belongs to the vascular tunic (middle layer) and contains pigmented cells and two sets
of smooth muscles: the sphincter pupillae (constricts the pupil, parasympathetic) and the dilator
pupillae (dilates the pupil, sympathetic). The iris controls the size of the pupil — the central opening —
thereby regulating the amount of light entering the eye. In bright light, the pupil constricts (miosis); in
dim light, it dilates (mydriasis). The pupil itself (choice A) is just the opening, not a pigmented
structure. The cornea (choice C) is transparent and colorless. The choroid (choice D) is internal to the
iris and not visible externally. Eye color depends on the amount and type of melanin in the iris stroma.
Page 2 | Portage Learning — A&P 1 Module 6 Lab Exam
, A&P 1 101 Module 6 Lab Exam | Portage Learning Special Senses & Endocrine System
Q4: A patient is diagnosed with glaucoma, a condition characterized by increased
intraocular pressure due to impaired drainage of aqueous humor. Which structure
produces aqueous humor, and which two chambers of the anterior cavity does it circulate
through?
A. Produced by the retina; circulates between the anterior and posterior chambers
B. Produced by the ciliary body; circulates from the posterior chamber (between iris and
lens) through the pupil into the anterior chamber (between cornea and iris) [CORRECT]
C. Produced by the choroid; circulates only in the anterior chamber
D. Produced by the lens; circulates between the vitreous chamber and the anterior chamber
Correct Answer: B
Rationale: Aqueous humor is a clear fluid produced by the ciliary body (part of the vascular tunic). It
is secreted into the posterior chamber (the small space between the iris and the suspensory ligament
of the lens), flows through the pupil into the anterior chamber (between the cornea and iris), and is
drained through the canal of Schlemm into the venous circulation. Aqueous humor nourishes the
avascular cornea and lens and maintains intraocular pressure. In glaucoma, drainage is impaired
(usually at the canal of Schlemm), causing fluid buildup and elevated pressure that damages the optic
nerve. Choice A incorrectly attributes production to the retina. Choice C incorrectly attributes
production to the choroid. Choice D incorrectly attributes production to the lens, and the vitreous
chamber contains vitreous humor, not aqueous.
Q5: During a fundoscopic examination, the physician identifies the area of the retina with
the highest concentration of cones and the greatest visual acuity. What is this region called,
and what is its functional significance?
A. Optic disc; where the optic nerve exits the eye and photoreceptors are most dense
B. Fovea centralis; contains only cones and provides the sharpest, color vision [CORRECT]
C. Macula lutea; contains only rods for high-sensitivity vision in dim light
D. Tapetum lucidum; reflects light to enhance night vision
Correct Answer: B
Rationale: The fovea centralis is a tiny depression in the center of the macula lutea of the retina. It
contains only cones (no rods) and no overlying blood vessels or ganglion cells, allowing light to strike
the photoreceptors directly. This anatomical arrangement provides the highest visual acuity and
sharpest color vision. When we look directly at an object, its image falls on the fovea. The optic disc
(choice A) is the blind spot — where the optic nerve exits the retina — and contains no photoreceptors.
The macula lutea (choice C) surrounds the fovea and contains both rods and cones; it does not contain
only rods. The tapetum lucidum (choice D) is a reflective layer found in some animals (e.g., cats, dogs)
but is absent in humans.
Page 3 | Portage Learning — A&P 1 Module 6 Lab Exam
A&P 1 101 Module 6 Lab Exam — Questions and
Answers
Portage Learning • Special Senses & Endocrine System
Anatomy & Physiology I — Module 6 Lab Examination
45 Questions • Cognitive Mix: 30% Recall / 45% Application / 25% Analysis
Format: 60% Scenario/Labeling/Essay-Based • 25% Direct Recall • 15% Matching
This 45-question Portage Learning A&P 1 101 Module 6 Lab examination comprehensively assesses
the special senses (eye, ear, sensory receptors) and the endocrine system across six content domains:
(1) eye anatomy and vision, (2) ear anatomy and hearing/balance, (3) sensory receptors and
pathways, (4) endocrine system overview, (5) major endocrine glands and their hormones, and (6)
clinical applications and integrated scenarios. Each question is anchored to specific Portage
Learning Module 6 lab objectives and includes a detailed rationale explaining the anatomical
structures, physiological processes, hormonal regulation, and clinical reasoning required to select
the correct answer. The exam emphasizes scenario-based clinical application, anatomical labeling,
hormone identification, receptor classification, and the integration of structure with function —
including visual and auditory pathways, endocrine feedback loops, hormone-cell pairings, and the
pathophysiology of common endocrine and sensory disorders.
Section 1: Special Senses — Eye Anatomy and Vision
Q1: During an eye dissection lab, a student identifies three distinct layers of the eyeball.
Which of the following correctly lists the three tunics of the eye from outermost to
innermost, along with their primary components?
A. Retinal tunic (retina); Vascular tunic (choroid, ciliary body, iris); Fibrous tunic (sclera,
cornea)
B. Fibrous tunic (sclera, cornea); Vascular tunic (choroid, ciliary body, iris); Nervous tunic
(retina) [CORRECT]
C. Nervous tunic (retina); Fibrous tunic (sclera, cornea); Vascular tunic (choroid, ciliary body)
D. Vascular tunic (choroid only); Nervous tunic (retina, iris); Fibrous tunic (sclera, lens)
Correct Answer: B
Rationale: The eyeball wall is composed of three concentric tunics. The outermost fibrous tunic
consists of the sclera (white, opaque, protective) and the cornea (transparent, anterior, refracts light).
The middle vascular tunic (uvea) consists of the choroid (highly vascular, nourishes retina and
absorbs stray light), ciliary body (contains ciliary muscles that control lens shape and secretes aqueous
humor), and iris (colored portion with pupil that regulates light entry). The innermost nervous tunic is
the retina, which contains the photoreceptors (rods and cones) and the neurons of the visual pathway.
Choice A reverses the order. Choice C also reverses the order. Choice D misplaces the iris (which is
part of the vascular tunic, not the nervous tunic) and incorrectly lists the lens (which is not part of any
tunic).
Page 1 | Portage Learning — A&P 1 Module 6 Lab Exam
,A&P 1 101 Module 6 Lab Exam | Portage Learning Special Senses & Endocrine System
Q2: A patient presents with a corneal abrasion after scratching their eye. The physician
notes that the cornea is avascular. Which tunic of the eye contains the cornea, and how does
the cornea receive oxygen and nutrients despite being avascular?
A. Vascular tunic; receives nutrients from the choroid blood vessels
B. Fibrous tunic; receives oxygen and nutrients from the aqueous humor and tear film
[CORRECT]
C. Nervous tunic; receives nutrients from the retinal blood supply
D. Fibrous tunic; receives nutrients exclusively from the vitreous humor
Correct Answer: B
Rationale: The cornea is part of the fibrous tunic (the outermost layer of the eye, along with the
sclera). Although the sclera has some blood vessels, the cornea is avascular — it lacks blood vessels —
to maintain its transparency, which is essential for vision. The cornea receives oxygen primarily by
diffusion from the air (via the tear film) and nutrients from the aqueous humor that fills the anterior
chamber behind it. The lacrimal (tear) fluid also contributes to oxygen supply and nourishment.
Choice A incorrectly places the cornea in the vascular tunic. Choice C incorrectly places it in the
nervous tunic. Choice D is incorrect because the vitreous humor is in the posterior cavity, behind the
lens, and does not bathe the cornea. Corneal avascularity is also why corneal transplants typically do
not require tissue matching.
Q3: An ophthalmologist examines a patient's eye and observes the colored portion that
determines whether the patient has brown, blue, or green eyes. Which structure is being
observed, what tunic does it belong to, and what is its functional role?
A. Pupil; nervous tunic; controls the amount of light entering
B. Iris; vascular tunic; regulates pupil size and the amount of light entering the eye
[CORRECT]
C. Cornea; fibrous tunic; refracts light entering the eye
D. Choroid; vascular tunic; absorbs stray light within the eye
Correct Answer: B
Rationale: The iris is the colored, visible portion of the eye that determines eye color (brown, blue,
green, hazel). It belongs to the vascular tunic (middle layer) and contains pigmented cells and two sets
of smooth muscles: the sphincter pupillae (constricts the pupil, parasympathetic) and the dilator
pupillae (dilates the pupil, sympathetic). The iris controls the size of the pupil — the central opening —
thereby regulating the amount of light entering the eye. In bright light, the pupil constricts (miosis); in
dim light, it dilates (mydriasis). The pupil itself (choice A) is just the opening, not a pigmented
structure. The cornea (choice C) is transparent and colorless. The choroid (choice D) is internal to the
iris and not visible externally. Eye color depends on the amount and type of melanin in the iris stroma.
Page 2 | Portage Learning — A&P 1 Module 6 Lab Exam
, A&P 1 101 Module 6 Lab Exam | Portage Learning Special Senses & Endocrine System
Q4: A patient is diagnosed with glaucoma, a condition characterized by increased
intraocular pressure due to impaired drainage of aqueous humor. Which structure
produces aqueous humor, and which two chambers of the anterior cavity does it circulate
through?
A. Produced by the retina; circulates between the anterior and posterior chambers
B. Produced by the ciliary body; circulates from the posterior chamber (between iris and
lens) through the pupil into the anterior chamber (between cornea and iris) [CORRECT]
C. Produced by the choroid; circulates only in the anterior chamber
D. Produced by the lens; circulates between the vitreous chamber and the anterior chamber
Correct Answer: B
Rationale: Aqueous humor is a clear fluid produced by the ciliary body (part of the vascular tunic). It
is secreted into the posterior chamber (the small space between the iris and the suspensory ligament
of the lens), flows through the pupil into the anterior chamber (between the cornea and iris), and is
drained through the canal of Schlemm into the venous circulation. Aqueous humor nourishes the
avascular cornea and lens and maintains intraocular pressure. In glaucoma, drainage is impaired
(usually at the canal of Schlemm), causing fluid buildup and elevated pressure that damages the optic
nerve. Choice A incorrectly attributes production to the retina. Choice C incorrectly attributes
production to the choroid. Choice D incorrectly attributes production to the lens, and the vitreous
chamber contains vitreous humor, not aqueous.
Q5: During a fundoscopic examination, the physician identifies the area of the retina with
the highest concentration of cones and the greatest visual acuity. What is this region called,
and what is its functional significance?
A. Optic disc; where the optic nerve exits the eye and photoreceptors are most dense
B. Fovea centralis; contains only cones and provides the sharpest, color vision [CORRECT]
C. Macula lutea; contains only rods for high-sensitivity vision in dim light
D. Tapetum lucidum; reflects light to enhance night vision
Correct Answer: B
Rationale: The fovea centralis is a tiny depression in the center of the macula lutea of the retina. It
contains only cones (no rods) and no overlying blood vessels or ganglion cells, allowing light to strike
the photoreceptors directly. This anatomical arrangement provides the highest visual acuity and
sharpest color vision. When we look directly at an object, its image falls on the fovea. The optic disc
(choice A) is the blind spot — where the optic nerve exits the retina — and contains no photoreceptors.
The macula lutea (choice C) surrounds the fovea and contains both rods and cones; it does not contain
only rods. The tapetum lucidum (choice D) is a reflective layer found in some animals (e.g., cats, dogs)
but is absent in humans.
Page 3 | Portage Learning — A&P 1 Module 6 Lab Exam
