,BIOD152/BIOD 152 Module 3 Exam | Essential Human
Anatomy & Physiology II with Lab | Portage Learning | Q & A |
2026/2027 Edition (PDF)
1. Which of the following best describes the primary function of the special senses?
A) To regulate involuntary functions such as heart rate and digestion
B) To provide information about the external environment through specialized organs
C) To control voluntary skeletal muscle movements
D) To filter waste products from the blood
Correct Answer: To provide information about the external environment through specialized organs
Rationale: The special senses, including vision, hearing, equilibrium, smell, and taste, use specialized
organs to detect stimuli from the external environment. This information is sent to the brain for
processing, allowing us to perceive and interact with the world around us.
2. Which sense does NOT have specialized sense organs?
A) Smell
B) Equilibrium
C) Touch
D) Vision
Correct Answer: Touch
Rationale: Touch is a general sense that relies on receptors distributed throughout the skin and other
tissues, not on a single specialized organ. Smell, equilibrium, and vision all have dedicated organs such
as the olfactory epithelium, vestibular apparatus, and eyes, respectively.
3. What is the outermost fibrous layer of the eye called?
A) Choroid
B) Retina
,C) Sclera
D) Conjunctiva
Correct Answer: Sclera
Rationale: The sclera is the tough, white, outer fibrous layer of the eye that provides protection and
maintains the eye's shape. The choroid is the vascular middle layer, and the retina is the inner neural
layer.
4. The posterior portion of the outer fibrous layer of the eye is specifically called the:
A) Cornea
B) Sclera
C) Choroid
D) Ciliary body
Correct Answer: Sclera
Rationale: The outer fibrous layer of the eye consists of the cornea (anterior, transparent portion) and
the sclera (posterior, white portion). The sclera provides structural support and attachment for the
extraocular muscles.
5. Which portion of the eye supplies blood to the other layers of the eye?
A) Sclera
B) Retina
C) Choroid
D) Cornea
Correct Answer: Choroid
, Rationale: The choroid is the highly vascularized middle layer of the eye, located between the sclera and
the retina. Its rich blood supply nourishes the outer layers of the retina and other ocular structures.
6. The middle layer of the eye includes which regions?
A) Sclera and cornea
B) Ciliary body and iris
C) Pupil and retina
D) Lens and vitreous fluid
Correct Answer: Ciliary body and iris
Rationale: The middle layer of the eye, or uvea, consists of the choroid, ciliary body, and iris. The ciliary
body produces aqueous humor and controls lens shape, while the iris regulates the amount of light
entering the eye.
7. Which structure in the eye is responsible for adjusting the shape of the lens to focus light on the
retina?
A) Iris
B) Choroid
C) Ciliary body
D) Sclera
Correct Answer: Ciliary body
Rationale: The ciliary body contains smooth muscle that contracts and relaxes to change the shape of
the lens in a process called accommodation. This allows the eye to focus on objects at varying distances.
8. True or false: The more numerous type of photoreceptors are rods.
A) True
B) False
Anatomy & Physiology II with Lab | Portage Learning | Q & A |
2026/2027 Edition (PDF)
1. Which of the following best describes the primary function of the special senses?
A) To regulate involuntary functions such as heart rate and digestion
B) To provide information about the external environment through specialized organs
C) To control voluntary skeletal muscle movements
D) To filter waste products from the blood
Correct Answer: To provide information about the external environment through specialized organs
Rationale: The special senses, including vision, hearing, equilibrium, smell, and taste, use specialized
organs to detect stimuli from the external environment. This information is sent to the brain for
processing, allowing us to perceive and interact with the world around us.
2. Which sense does NOT have specialized sense organs?
A) Smell
B) Equilibrium
C) Touch
D) Vision
Correct Answer: Touch
Rationale: Touch is a general sense that relies on receptors distributed throughout the skin and other
tissues, not on a single specialized organ. Smell, equilibrium, and vision all have dedicated organs such
as the olfactory epithelium, vestibular apparatus, and eyes, respectively.
3. What is the outermost fibrous layer of the eye called?
A) Choroid
B) Retina
,C) Sclera
D) Conjunctiva
Correct Answer: Sclera
Rationale: The sclera is the tough, white, outer fibrous layer of the eye that provides protection and
maintains the eye's shape. The choroid is the vascular middle layer, and the retina is the inner neural
layer.
4. The posterior portion of the outer fibrous layer of the eye is specifically called the:
A) Cornea
B) Sclera
C) Choroid
D) Ciliary body
Correct Answer: Sclera
Rationale: The outer fibrous layer of the eye consists of the cornea (anterior, transparent portion) and
the sclera (posterior, white portion). The sclera provides structural support and attachment for the
extraocular muscles.
5. Which portion of the eye supplies blood to the other layers of the eye?
A) Sclera
B) Retina
C) Choroid
D) Cornea
Correct Answer: Choroid
, Rationale: The choroid is the highly vascularized middle layer of the eye, located between the sclera and
the retina. Its rich blood supply nourishes the outer layers of the retina and other ocular structures.
6. The middle layer of the eye includes which regions?
A) Sclera and cornea
B) Ciliary body and iris
C) Pupil and retina
D) Lens and vitreous fluid
Correct Answer: Ciliary body and iris
Rationale: The middle layer of the eye, or uvea, consists of the choroid, ciliary body, and iris. The ciliary
body produces aqueous humor and controls lens shape, while the iris regulates the amount of light
entering the eye.
7. Which structure in the eye is responsible for adjusting the shape of the lens to focus light on the
retina?
A) Iris
B) Choroid
C) Ciliary body
D) Sclera
Correct Answer: Ciliary body
Rationale: The ciliary body contains smooth muscle that contracts and relaxes to change the shape of
the lens in a process called accommodation. This allows the eye to focus on objects at varying distances.
8. True or false: The more numerous type of photoreceptors are rods.
A) True
B) False
