BIOD 151 A&P 1 MODULE 7 EXAM PORTAGE LEARNING EXAM
QUESTIONS AND CORRECT DETAILED ANSWERS WITH
RATIONALES (VERIFIED ANSWERS) 2025 LATEST UPDATED AGRADE
Question 1
Which layer of the epidermis is characterized by cells producing a protein that protects the skin,
and is located just superficial to the stratum spinosum?
A) Stratum basale
B) Stratum corneum
C) Stratum granulosum
D) Stratum lucidum
E) Dermis
Correct Answer: C) Stratum granulosum
Rationale: The stratum granulosum is a layer within the epidermis, found superficial to the
stratum spinosum, where keratinocytes begin to produce keratin and lamellar granules,
contributing to the skin's protective barrier. The question directly references the stratum
granulosum as a region within the epidermis from the provided information.
Question 2
Identify the sensory cell receptor that primarily detects light touch and vibration, also known as a
mechanoreceptor.
A) Pacinian corpuscle
B) Merkel cell
C) Thermoreceptor
D) Meissner's corpuscle
E) Nociceptor
Correct Answer: D) Meissner's corpuscle
Rationale: Meissner's corpuscles are sensory receptors specifically adapted to detect light
touch and vibration. They are classified as mechanoreceptors because they respond to
mechanical stimuli. The provided information explicitly states that Meissner's corpuscles
detect light touch and vibration.
Question 3
Which sensory receptor is responsible for detecting deep pressure in the skin?
A) Meissner's corpuscle
B) Merkel cell
C) Pacinian corpuscle
D) Free nerve ending
E) Ruffini ending
Correct Answer: C) Pacinian corpuscle
Rationale: Pacinian corpuscles are specialized encapsulated nerve endings located deep in
the dermis and hypodermis. They are particularly sensitive to deep pressure and vibration,
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acting as mechanoreceptors. The provided information identifies Pacinian corpuscles as
detecting pressure.
Question 4
Which sequence correctly lists the layers of the epidermis from the deepest layer to the most
superficial layer?
A) Stratum corneum, stratum granulosum, stratum spinosum, stratum basale
B) Stratum basale, stratum spinosum, stratum granulosum, stratum corneum
C) Stratum spinosum, stratum basale, stratum granulosum, stratum corneum
D) Stratum granulosum, stratum corneum, stratum basale, stratum spinosum
E) Stratum basale, stratum granulosum, stratum spinosum, stratum corneum
Correct Answer: B) Stratum basale, stratum spinosum, stratum granulosum, stratum
corneum
Rationale: The epidermis has four or five layers, depending on the skin type. From deep to
superficial, these layers are the stratum basale (germinativum), stratum spinosum, stratum
granulosum, and stratum corneum. In thick skin, an additional layer called the stratum
lucidum is present between the stratum granulosum and stratum corneum.
Question 5
Which sequence correctly lists the layers of the epidermis from the most superficial layer to the
deepest layer?
A) Stratum corneum, stratum granulosum, stratum spinosum, stratum basale
B) Stratum basale, stratum spinosum, stratum granulosum, stratum corneum
C) Stratum spinosum, stratum basale, stratum granulosum, stratum corneum
D) Stratum granulosum, stratum corneum, stratum basale, stratum spinosum
E) Stratum basale, stratum granulosum, stratum spinosum, stratum corneum
Correct Answer: A) Stratum corneum, stratum granulosum, stratum spinosum, stratum
basale
Rationale: The epidermis is structured in distinct layers. When listing them from superficial
to deep, the correct order is stratum corneum, followed by stratum granulosum, stratum
spinosum, and finally the deepest layer, the stratum basale.
Question 6
Which of the following statements accurately describes the secretion mechanisms of exocrine
and endocrine glands?
A) Exocrine glands secrete for body-wide distribution; Endocrine glands secrete into an
epithelial lining.
B) Exocrine glands secrete into an epithelial lining; Endocrine glands secrete for body-wide
distribution.
C) Exocrine glands secrete through a duct; Endocrine glands secrete into the bloodstream.
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D) Exocrine glands secrete into the bloodstream; Endocrine glands secrete through a duct.
E) Both B and C.
Correct Answer: E) Both B and C.
Rationale: Exocrine glands secrete their products (e.g., sweat, oil, digestive enzymes) onto
an epithelial surface, often via a duct (e.g., sweat glands, sebaceous glands). Endocrine
glands, on the other hand, secrete hormones directly into the bloodstream for distribution
throughout the body, without the use of ducts (e.g., thyroid gland, adrenal gland).
Therefore, both B and C are correct descriptions.
Question 7
Which statement is true regarding the epidermis?
A) It contains a rich blood supply within its deepest layer.
B) It receives its blood supply from the deeper dermis layer.
C) It is primarily composed of adipose tissue.
D) It is responsible for producing Vitamin C.
E) It contains the arrector pili muscles.
Correct Answer: B) It receives its blood supply from the deeper dermis layer.
Rationale: The epidermis is the outermost layer of the skin and is avascular, meaning it does
not contain its own blood vessels. It receives all of its nutrients and oxygen via diffusion
from the capillaries located in the underlying dermis layer.
Question 8
What is the primary function of fibroblasts in the skin?
A) Produce a pigment that absorbs UV rays.
B) Assist in immune responses.
C) Produce collagen.
D) Produce a protein to protect the skin.
E) Engulf bacteria.
Correct Answer: C) Produce collagen.
Rationale: Fibroblasts are the most common cells in connective tissue proper, particularly in
the dermis. Their primary function is to synthesize and secrete collagen and other
extracellular matrix components, which provide strength and elasticity to the skin.
Question 9
Which cell type is primarily responsible for producing a protein that protects the skin?
A) Fibroblast
B) Langerhans cell
C) Melanocyte
D) Keratinocyte
E) Macrophage
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Correct Answer: D) Keratinocyte
Rationale: Keratinocytes are the most abundant cells in the epidermis and are specialized to
produce keratin, a tough, fibrous protein that provides structural integrity and protection
to the skin against physical damage, water loss, and pathogens.
Question 10
Which cell type found in the skin plays a role in assisting immune responses?
A) Fibroblast
B) Keratinocyte
C) Melanocyte
D) Langerhans cell
E) Macrophage
Correct Answer: D) Langerhans cell
Rationale: Langerhans cells are dendritic cells located in the epidermis that function as
antigen-presenting cells. They play a crucial role in initiating and regulating immune
responses by capturing and presenting antigens to T lymphocytes.
Question 11
What is the primary function of melanocytes in the skin?
A) Produce collagen.
B) Assist in immune responses.
C) Produce a protein to protect the skin.
D) Produce a pigment that absorbs UV rays.
E) Engulf bacteria.
Correct Answer: D) Produce a pigment that absorbs UV rays.
Rationale: Melanocytes are specialized cells located in the stratum basale of the epidermis.
Their primary function is to produce melanin, a pigment that absorbs harmful ultraviolet
(UV) radiation from the sun, protecting the DNA of skin cells from damage.
Question 12
When a person accidentally touches a hot cup of coffee, what type of sensory organ detects this
information?
A) Mechanoreceptor
B) Photoreceptor
C) Chemoreceptor
D) Thermoreceptor
E) Nociceptor
Correct Answer: D) Thermoreceptor
Rationale: Thermoreceptors are specialized sensory receptors that detect changes in
QUESTIONS AND CORRECT DETAILED ANSWERS WITH
RATIONALES (VERIFIED ANSWERS) 2025 LATEST UPDATED AGRADE
Question 1
Which layer of the epidermis is characterized by cells producing a protein that protects the skin,
and is located just superficial to the stratum spinosum?
A) Stratum basale
B) Stratum corneum
C) Stratum granulosum
D) Stratum lucidum
E) Dermis
Correct Answer: C) Stratum granulosum
Rationale: The stratum granulosum is a layer within the epidermis, found superficial to the
stratum spinosum, where keratinocytes begin to produce keratin and lamellar granules,
contributing to the skin's protective barrier. The question directly references the stratum
granulosum as a region within the epidermis from the provided information.
Question 2
Identify the sensory cell receptor that primarily detects light touch and vibration, also known as a
mechanoreceptor.
A) Pacinian corpuscle
B) Merkel cell
C) Thermoreceptor
D) Meissner's corpuscle
E) Nociceptor
Correct Answer: D) Meissner's corpuscle
Rationale: Meissner's corpuscles are sensory receptors specifically adapted to detect light
touch and vibration. They are classified as mechanoreceptors because they respond to
mechanical stimuli. The provided information explicitly states that Meissner's corpuscles
detect light touch and vibration.
Question 3
Which sensory receptor is responsible for detecting deep pressure in the skin?
A) Meissner's corpuscle
B) Merkel cell
C) Pacinian corpuscle
D) Free nerve ending
E) Ruffini ending
Correct Answer: C) Pacinian corpuscle
Rationale: Pacinian corpuscles are specialized encapsulated nerve endings located deep in
the dermis and hypodermis. They are particularly sensitive to deep pressure and vibration,
,[Type here]
acting as mechanoreceptors. The provided information identifies Pacinian corpuscles as
detecting pressure.
Question 4
Which sequence correctly lists the layers of the epidermis from the deepest layer to the most
superficial layer?
A) Stratum corneum, stratum granulosum, stratum spinosum, stratum basale
B) Stratum basale, stratum spinosum, stratum granulosum, stratum corneum
C) Stratum spinosum, stratum basale, stratum granulosum, stratum corneum
D) Stratum granulosum, stratum corneum, stratum basale, stratum spinosum
E) Stratum basale, stratum granulosum, stratum spinosum, stratum corneum
Correct Answer: B) Stratum basale, stratum spinosum, stratum granulosum, stratum
corneum
Rationale: The epidermis has four or five layers, depending on the skin type. From deep to
superficial, these layers are the stratum basale (germinativum), stratum spinosum, stratum
granulosum, and stratum corneum. In thick skin, an additional layer called the stratum
lucidum is present between the stratum granulosum and stratum corneum.
Question 5
Which sequence correctly lists the layers of the epidermis from the most superficial layer to the
deepest layer?
A) Stratum corneum, stratum granulosum, stratum spinosum, stratum basale
B) Stratum basale, stratum spinosum, stratum granulosum, stratum corneum
C) Stratum spinosum, stratum basale, stratum granulosum, stratum corneum
D) Stratum granulosum, stratum corneum, stratum basale, stratum spinosum
E) Stratum basale, stratum granulosum, stratum spinosum, stratum corneum
Correct Answer: A) Stratum corneum, stratum granulosum, stratum spinosum, stratum
basale
Rationale: The epidermis is structured in distinct layers. When listing them from superficial
to deep, the correct order is stratum corneum, followed by stratum granulosum, stratum
spinosum, and finally the deepest layer, the stratum basale.
Question 6
Which of the following statements accurately describes the secretion mechanisms of exocrine
and endocrine glands?
A) Exocrine glands secrete for body-wide distribution; Endocrine glands secrete into an
epithelial lining.
B) Exocrine glands secrete into an epithelial lining; Endocrine glands secrete for body-wide
distribution.
C) Exocrine glands secrete through a duct; Endocrine glands secrete into the bloodstream.
,[Type here]
D) Exocrine glands secrete into the bloodstream; Endocrine glands secrete through a duct.
E) Both B and C.
Correct Answer: E) Both B and C.
Rationale: Exocrine glands secrete their products (e.g., sweat, oil, digestive enzymes) onto
an epithelial surface, often via a duct (e.g., sweat glands, sebaceous glands). Endocrine
glands, on the other hand, secrete hormones directly into the bloodstream for distribution
throughout the body, without the use of ducts (e.g., thyroid gland, adrenal gland).
Therefore, both B and C are correct descriptions.
Question 7
Which statement is true regarding the epidermis?
A) It contains a rich blood supply within its deepest layer.
B) It receives its blood supply from the deeper dermis layer.
C) It is primarily composed of adipose tissue.
D) It is responsible for producing Vitamin C.
E) It contains the arrector pili muscles.
Correct Answer: B) It receives its blood supply from the deeper dermis layer.
Rationale: The epidermis is the outermost layer of the skin and is avascular, meaning it does
not contain its own blood vessels. It receives all of its nutrients and oxygen via diffusion
from the capillaries located in the underlying dermis layer.
Question 8
What is the primary function of fibroblasts in the skin?
A) Produce a pigment that absorbs UV rays.
B) Assist in immune responses.
C) Produce collagen.
D) Produce a protein to protect the skin.
E) Engulf bacteria.
Correct Answer: C) Produce collagen.
Rationale: Fibroblasts are the most common cells in connective tissue proper, particularly in
the dermis. Their primary function is to synthesize and secrete collagen and other
extracellular matrix components, which provide strength and elasticity to the skin.
Question 9
Which cell type is primarily responsible for producing a protein that protects the skin?
A) Fibroblast
B) Langerhans cell
C) Melanocyte
D) Keratinocyte
E) Macrophage
, [Type here]
Correct Answer: D) Keratinocyte
Rationale: Keratinocytes are the most abundant cells in the epidermis and are specialized to
produce keratin, a tough, fibrous protein that provides structural integrity and protection
to the skin against physical damage, water loss, and pathogens.
Question 10
Which cell type found in the skin plays a role in assisting immune responses?
A) Fibroblast
B) Keratinocyte
C) Melanocyte
D) Langerhans cell
E) Macrophage
Correct Answer: D) Langerhans cell
Rationale: Langerhans cells are dendritic cells located in the epidermis that function as
antigen-presenting cells. They play a crucial role in initiating and regulating immune
responses by capturing and presenting antigens to T lymphocytes.
Question 11
What is the primary function of melanocytes in the skin?
A) Produce collagen.
B) Assist in immune responses.
C) Produce a protein to protect the skin.
D) Produce a pigment that absorbs UV rays.
E) Engulf bacteria.
Correct Answer: D) Produce a pigment that absorbs UV rays.
Rationale: Melanocytes are specialized cells located in the stratum basale of the epidermis.
Their primary function is to produce melanin, a pigment that absorbs harmful ultraviolet
(UV) radiation from the sun, protecting the DNA of skin cells from damage.
Question 12
When a person accidentally touches a hot cup of coffee, what type of sensory organ detects this
information?
A) Mechanoreceptor
B) Photoreceptor
C) Chemoreceptor
D) Thermoreceptor
E) Nociceptor
Correct Answer: D) Thermoreceptor
Rationale: Thermoreceptors are specialized sensory receptors that detect changes in
