CHAMBERLAIN UNIVERSITY · COLLEGE OF
NURSING
BIOS 251
Anatomy & Physiology
I
with Lab
Exam 2 Essay Review: 50 comprehensive multiple-choice questions
covering the integumentary system, skeletal system, muscle tissue and
physiology, and integrated clinical scenarios aligned with 2026-2027
curriculum standards.
Course: BIOS 251 Anatomy & Physiology I with Lab
Assessment: Exam 2 Essay Review
Total Questions: 50 (Four-Choice MCQ with Rationales)
Cognitive Levels: Recall 20% · Application 50% · Analysis 30%
Latest Update:
V E RI F I E D A NSW E RS · 10 0 % CORRE CT · A + GRA D E CONTE NT
,BIOS 251 Anatomy & Physiology I with Lab | Exam 2 Essay Review Chamberlain University | 2026-2027
Section 1: Integumentary System
Questions Q1-Q15
1. [Recall] Which stratum of the epidermis is composed of 20–30 layers of dead, flattened keratinocytes that
provide the greatest barrier against water loss and is present in both thick and thin skin?
A. Stratum basale
B. Stratum spinosum
C. Stratum granulosum
D. Stratum corneum
Correct Answer: D
Rationale: The stratum corneum is the outermost layer of the epidermis, consisting of 20–30 layers of anucleate, flattened
keratinocytes packed with keratin. This thick, cornified layer provides the primary barrier against water loss, microbial entry, and
abrasion. The stratum basale (A) is the deepest mitotically active layer attached to the basement membrane, not the barrier layer.
The stratum spinosum (B) contains 8–10 layers of cells connected by desmosomes and is the primary site of Langerhans cell
activity. The stratum granulosum (C) contains 3–5 layers of cells with keratohyalin granules that initiate keratin formation, but
these cells are not yet fully keratinized and do not form the waterproof barrier.
2. [Recall] Which of the following is NOT considered a primary function of the integumentary system?
A. Protection against ultraviolet radiation and pathogens
B. Synthesis of vitamin D from a cholesterol derivative
C. Production of hormones that regulate blood glucose levels
D. Regulation of body temperature through sweating and vasodilation
Correct Answer: C
Rationale: The integumentary system does not produce hormones that regulate blood glucose; that function belongs to the pancreas
(insulin and glucagon) and adrenal cortex (cortisol). Protection against UV radiation through melanin production (A), vitamin D
synthesis when UVB radiation converts 7-dehydrocholesterol to cholecalciferol in the epidermis (B), and thermoregulation
through eccrine sweat gland secretion and cutaneous vasodilation or vasoconstriction (D) are all well-established functions of the
skin. Students sometimes confuse the skin's role in vitamin D production with endocrine hormone secretion, but vitamin D acts as a
secosteroid hormone after hepatic and renal activation, not as a glucose-regulating hormone.
3. [Recall] Sebaceous glands secrete sebum into hair follicles through a short duct. Which of the following
correctly describes the composition and primary function of sebum?
A. A watery secretion containing electrolytes and metabolic waste products that cools the body
B. An oily substance composed of lipids, triglycerides, and cholesterol esters that lubricates the skin and
hair
C. A protein-rich secretion containing keratin and melanin that provides structural support to the dermis
D. A waxy secretion composed of cerumen and dead keratinocytes that protects the external ear canal
Correct Answer: B
Rationale: Sebum is an oily substance produced by sebaceous glands, consisting primarily of triglycerides, wax esters, squalene,
and cholesterol esters. It lubricates the hair shaft and the surface of the skin, helps prevent excessive water loss, and has mild
antibacterial and antifungal properties. Option A describes eccrine sweat, not sebum. Option C incorrectly describes sebum as
protein-rich with keratin and melanin; keratin and melanin are products of keratinocytes and melanocytes, respectively, not
Page 1
, BIOS 251 Anatomy & Physiology I with Lab | Exam 2 Essay Review Chamberlain University | 2026-2027
secretions of sebaceous glands. Option D describes cerumen (earwax), which is produced by ceruminous glands in the external
auditory canal, not by sebaceous glands. Students commonly confuse sebaceous gland secretions with sweat gland secretions or
cerumen.
4. [App] A 35-year-old chef arrives at the emergency department after spilling a pot of hot oil on his right
forearm. The skin appears red with fluid-filled blisters, and the patient reports intense, throbbing pain in the
affected area. The blisters are intact and the skin surrounding the blisters is erythematous. Which degree of burn
has this patient most likely sustained?
A. First-degree burn, involving only the epidermis
B. Second-degree (partial-thickness) burn, involving the epidermis and upper dermis
C. Third-degree (full-thickness) burn, involving the epidermis, dermis, and hypodermis
D. Fourth-degree burn, involving the skin and underlying muscle and bone
Correct Answer: B
Rationale: This patient presents with classic signs of a second-degree (partial-thickness) burn: erythema, fluid-filled blisters, and
intense pain. The presence of blisters indicates that the burn has extended through the epidermis into the upper dermis (papillary
dermis), damaging the capillary loops and exposing nerve endings, which accounts for the severe pain. A first-degree burn (A)
involves only the epidermis, causing redness and pain but no blisters, as seen in a mild sunburn. A third-degree burn (C) destroys
the full thickness of the epidermis and dermis and may extend into the hypodermis, resulting in a dry, leathery, white or charred
appearance with no pain because nerve endings are destroyed. A fourth-degree burn (D) extends beyond the skin into underlying
structures such as muscle, tendon, or bone and is not described in this scenario.
5. [App] A 28-year-old woman presents to her dermatologist for a follow-up visit after a superficial abrasion on
her knee from a cycling accident. The wound was cleaned and covered with a sterile dressing. After two weeks, the
wound has completely re-epithelialized with no visible scarring. Which phase of wound healing was primarily
responsible for restoring the epidermal barrier in this patient, and why was scarring minimal?
A. The inflammatory phase, because neutrophils and macrophages removed debris and prevented infection
B. The proliferative phase, because granulation tissue filled the wound defect and new blood vessels formed
C. The maturation (remodeling) phase, because collagen fibers were reorganized to increase tensile strength
D. The epithelialization phase within proliferation, because basal keratinocytes migrated across the
superficial wound bed
Correct Answer: D
Rationale: In superficial wounds limited to the epidermis, healing occurs primarily through epithelialization, which is a component
of the proliferative phase. Basal keratinocytes from the stratum basale at the wound edges and from hair follicles migrate across
the wound surface, divide, and restore the epidermal barrier. Because the wound did not extend into the dermis, granulation tissue
formation (B) and significant collagen deposition (C) were not required, resulting in no visible scar. The inflammatory phase (A)
occurs in all wounds but is brief in superficial injuries; it is not the phase responsible for restoring the epidermis. Students often
confuse deep wound healing, which requires all three phases (inflammation, proliferation, and remodeling), with superficial
epidermal healing, which primarily involves epithelial migration and cell division from the stratum basale.
6. [App] A 14-year-old boy complains of excessive underarm sweating and body odor that causes social
embarrassment, particularly during physical education class. His mother notes that these symptoms began
approximately six months ago when he started going through puberty. Physical examination reveals no signs of
infection or hyperthyroidism. Which type of sweat gland is most directly responsible for the increased secretion
and associated odor in this adolescent?
A. Eccrine glands, because they are the most numerous sweat glands and produce the highest volume of sweat
Page 2
NURSING
BIOS 251
Anatomy & Physiology
I
with Lab
Exam 2 Essay Review: 50 comprehensive multiple-choice questions
covering the integumentary system, skeletal system, muscle tissue and
physiology, and integrated clinical scenarios aligned with 2026-2027
curriculum standards.
Course: BIOS 251 Anatomy & Physiology I with Lab
Assessment: Exam 2 Essay Review
Total Questions: 50 (Four-Choice MCQ with Rationales)
Cognitive Levels: Recall 20% · Application 50% · Analysis 30%
Latest Update:
V E RI F I E D A NSW E RS · 10 0 % CORRE CT · A + GRA D E CONTE NT
,BIOS 251 Anatomy & Physiology I with Lab | Exam 2 Essay Review Chamberlain University | 2026-2027
Section 1: Integumentary System
Questions Q1-Q15
1. [Recall] Which stratum of the epidermis is composed of 20–30 layers of dead, flattened keratinocytes that
provide the greatest barrier against water loss and is present in both thick and thin skin?
A. Stratum basale
B. Stratum spinosum
C. Stratum granulosum
D. Stratum corneum
Correct Answer: D
Rationale: The stratum corneum is the outermost layer of the epidermis, consisting of 20–30 layers of anucleate, flattened
keratinocytes packed with keratin. This thick, cornified layer provides the primary barrier against water loss, microbial entry, and
abrasion. The stratum basale (A) is the deepest mitotically active layer attached to the basement membrane, not the barrier layer.
The stratum spinosum (B) contains 8–10 layers of cells connected by desmosomes and is the primary site of Langerhans cell
activity. The stratum granulosum (C) contains 3–5 layers of cells with keratohyalin granules that initiate keratin formation, but
these cells are not yet fully keratinized and do not form the waterproof barrier.
2. [Recall] Which of the following is NOT considered a primary function of the integumentary system?
A. Protection against ultraviolet radiation and pathogens
B. Synthesis of vitamin D from a cholesterol derivative
C. Production of hormones that regulate blood glucose levels
D. Regulation of body temperature through sweating and vasodilation
Correct Answer: C
Rationale: The integumentary system does not produce hormones that regulate blood glucose; that function belongs to the pancreas
(insulin and glucagon) and adrenal cortex (cortisol). Protection against UV radiation through melanin production (A), vitamin D
synthesis when UVB radiation converts 7-dehydrocholesterol to cholecalciferol in the epidermis (B), and thermoregulation
through eccrine sweat gland secretion and cutaneous vasodilation or vasoconstriction (D) are all well-established functions of the
skin. Students sometimes confuse the skin's role in vitamin D production with endocrine hormone secretion, but vitamin D acts as a
secosteroid hormone after hepatic and renal activation, not as a glucose-regulating hormone.
3. [Recall] Sebaceous glands secrete sebum into hair follicles through a short duct. Which of the following
correctly describes the composition and primary function of sebum?
A. A watery secretion containing electrolytes and metabolic waste products that cools the body
B. An oily substance composed of lipids, triglycerides, and cholesterol esters that lubricates the skin and
hair
C. A protein-rich secretion containing keratin and melanin that provides structural support to the dermis
D. A waxy secretion composed of cerumen and dead keratinocytes that protects the external ear canal
Correct Answer: B
Rationale: Sebum is an oily substance produced by sebaceous glands, consisting primarily of triglycerides, wax esters, squalene,
and cholesterol esters. It lubricates the hair shaft and the surface of the skin, helps prevent excessive water loss, and has mild
antibacterial and antifungal properties. Option A describes eccrine sweat, not sebum. Option C incorrectly describes sebum as
protein-rich with keratin and melanin; keratin and melanin are products of keratinocytes and melanocytes, respectively, not
Page 1
, BIOS 251 Anatomy & Physiology I with Lab | Exam 2 Essay Review Chamberlain University | 2026-2027
secretions of sebaceous glands. Option D describes cerumen (earwax), which is produced by ceruminous glands in the external
auditory canal, not by sebaceous glands. Students commonly confuse sebaceous gland secretions with sweat gland secretions or
cerumen.
4. [App] A 35-year-old chef arrives at the emergency department after spilling a pot of hot oil on his right
forearm. The skin appears red with fluid-filled blisters, and the patient reports intense, throbbing pain in the
affected area. The blisters are intact and the skin surrounding the blisters is erythematous. Which degree of burn
has this patient most likely sustained?
A. First-degree burn, involving only the epidermis
B. Second-degree (partial-thickness) burn, involving the epidermis and upper dermis
C. Third-degree (full-thickness) burn, involving the epidermis, dermis, and hypodermis
D. Fourth-degree burn, involving the skin and underlying muscle and bone
Correct Answer: B
Rationale: This patient presents with classic signs of a second-degree (partial-thickness) burn: erythema, fluid-filled blisters, and
intense pain. The presence of blisters indicates that the burn has extended through the epidermis into the upper dermis (papillary
dermis), damaging the capillary loops and exposing nerve endings, which accounts for the severe pain. A first-degree burn (A)
involves only the epidermis, causing redness and pain but no blisters, as seen in a mild sunburn. A third-degree burn (C) destroys
the full thickness of the epidermis and dermis and may extend into the hypodermis, resulting in a dry, leathery, white or charred
appearance with no pain because nerve endings are destroyed. A fourth-degree burn (D) extends beyond the skin into underlying
structures such as muscle, tendon, or bone and is not described in this scenario.
5. [App] A 28-year-old woman presents to her dermatologist for a follow-up visit after a superficial abrasion on
her knee from a cycling accident. The wound was cleaned and covered with a sterile dressing. After two weeks, the
wound has completely re-epithelialized with no visible scarring. Which phase of wound healing was primarily
responsible for restoring the epidermal barrier in this patient, and why was scarring minimal?
A. The inflammatory phase, because neutrophils and macrophages removed debris and prevented infection
B. The proliferative phase, because granulation tissue filled the wound defect and new blood vessels formed
C. The maturation (remodeling) phase, because collagen fibers were reorganized to increase tensile strength
D. The epithelialization phase within proliferation, because basal keratinocytes migrated across the
superficial wound bed
Correct Answer: D
Rationale: In superficial wounds limited to the epidermis, healing occurs primarily through epithelialization, which is a component
of the proliferative phase. Basal keratinocytes from the stratum basale at the wound edges and from hair follicles migrate across
the wound surface, divide, and restore the epidermal barrier. Because the wound did not extend into the dermis, granulation tissue
formation (B) and significant collagen deposition (C) were not required, resulting in no visible scar. The inflammatory phase (A)
occurs in all wounds but is brief in superficial injuries; it is not the phase responsible for restoring the epidermis. Students often
confuse deep wound healing, which requires all three phases (inflammation, proliferation, and remodeling), with superficial
epidermal healing, which primarily involves epithelial migration and cell division from the stratum basale.
6. [App] A 14-year-old boy complains of excessive underarm sweating and body odor that causes social
embarrassment, particularly during physical education class. His mother notes that these symptoms began
approximately six months ago when he started going through puberty. Physical examination reveals no signs of
infection or hyperthyroidism. Which type of sweat gland is most directly responsible for the increased secretion
and associated odor in this adolescent?
A. Eccrine glands, because they are the most numerous sweat glands and produce the highest volume of sweat
Page 2
