BIOL 251 — Module 4 Practice Assessment
2026 BIOL 251 Module 4 Exam Review
Human Anatomy & Physiology I with Lab
Practice Assessment with Correct Answers | Portage Learning
The Integumentary System — 68 Original Practice Questions
About this resource: This is an original, independently created study and practice-assessment document written to help
students review Module 4 (integumentary system) concepts for BIOL 251. It is not an actual, secured Portage Learning
examination and does not reproduce any proprietary Portage Learning question bank. All questions, answer choices,
rationales, and figures were created for this resource.
Format: 68 questions (multiple choice, true/false, matching, and image-based identification), organized by topic with
anatomy figures placed alongside the questions they support. A complete answer key with rationales follows the questions,
and a high-yield review with a Top 30 exam-day facts list follows the answer key.
Page 1 of 23
, BIOL 251 — Module 4 Practice Assessment
Section 1 — Overview & Functions of the Integumentary System
1. Which of the following best summarizes the primary functions of the integumentary system?
○ A) Protection, thermoregulation, sensation, and vitamin D synthesis
○ B) Hormone production, digestion, and filtration
○ C) Gas exchange, nutrient absorption, and waste excretion
○ D) Blood cell production and immune cell storage only
2. The epidermis is composed of which tissue type?
○ A) Simple columnar epithelium
○ B) Stratified squamous epithelium
○ C) Dense irregular connective tissue
○ D) Adipose tissue
3. The skin is the largest organ of the human body by surface area and weight.
○ True ○ False
4. Which statement correctly distinguishes the epidermis from the dermis?
○ A) The epidermis contains blood vessels; the dermis does not
○ B) The dermis is composed of dead, keratinized cells
○ C) The epidermis is avascular and nourished by diffusion from the dermis
○ D) The epidermis is thicker than the dermis in all body regions
Section 2 — The Epidermis and Epidermal Layers
Page 2 of 23
, BIOL 251 — Module 4 Practice Assessment
Figure 2 — Epidermal Layers
5. In Figure 2, which labeled layer is the stratum basale, the deepest epidermal layer responsible for continual
cell division?
○ A) Label E
○ B) Label C
○ C) Label D
○ D) Label A
6. Which labeled layer in Figure 2 corresponds to the stratum corneum, the outermost layer made of dead,
flattened, keratin-filled cells?
○ A) Label E
○ B) Label B
○ C) Label C
○ D) Label A
7. Arrange the epidermal layers in correct order from deepest to most superficial.
○ A) Corneum, lucidum, granulosum, spinosum, basale
○ B) Basale, spinosum, granulosum, lucidum, corneum
○ C) Basale, granulosum, spinosum, corneum, lucidum
○ D) Spinosum, basale, corneum, granulosum, lucidum
8. Keratinocytes are the predominant cell type of the epidermis. Their main structural role is to:
○ A) Secrete sebum to lubricate the skin surface
Page 3 of 23
2026 BIOL 251 Module 4 Exam Review
Human Anatomy & Physiology I with Lab
Practice Assessment with Correct Answers | Portage Learning
The Integumentary System — 68 Original Practice Questions
About this resource: This is an original, independently created study and practice-assessment document written to help
students review Module 4 (integumentary system) concepts for BIOL 251. It is not an actual, secured Portage Learning
examination and does not reproduce any proprietary Portage Learning question bank. All questions, answer choices,
rationales, and figures were created for this resource.
Format: 68 questions (multiple choice, true/false, matching, and image-based identification), organized by topic with
anatomy figures placed alongside the questions they support. A complete answer key with rationales follows the questions,
and a high-yield review with a Top 30 exam-day facts list follows the answer key.
Page 1 of 23
, BIOL 251 — Module 4 Practice Assessment
Section 1 — Overview & Functions of the Integumentary System
1. Which of the following best summarizes the primary functions of the integumentary system?
○ A) Protection, thermoregulation, sensation, and vitamin D synthesis
○ B) Hormone production, digestion, and filtration
○ C) Gas exchange, nutrient absorption, and waste excretion
○ D) Blood cell production and immune cell storage only
2. The epidermis is composed of which tissue type?
○ A) Simple columnar epithelium
○ B) Stratified squamous epithelium
○ C) Dense irregular connective tissue
○ D) Adipose tissue
3. The skin is the largest organ of the human body by surface area and weight.
○ True ○ False
4. Which statement correctly distinguishes the epidermis from the dermis?
○ A) The epidermis contains blood vessels; the dermis does not
○ B) The dermis is composed of dead, keratinized cells
○ C) The epidermis is avascular and nourished by diffusion from the dermis
○ D) The epidermis is thicker than the dermis in all body regions
Section 2 — The Epidermis and Epidermal Layers
Page 2 of 23
, BIOL 251 — Module 4 Practice Assessment
Figure 2 — Epidermal Layers
5. In Figure 2, which labeled layer is the stratum basale, the deepest epidermal layer responsible for continual
cell division?
○ A) Label E
○ B) Label C
○ C) Label D
○ D) Label A
6. Which labeled layer in Figure 2 corresponds to the stratum corneum, the outermost layer made of dead,
flattened, keratin-filled cells?
○ A) Label E
○ B) Label B
○ C) Label C
○ D) Label A
7. Arrange the epidermal layers in correct order from deepest to most superficial.
○ A) Corneum, lucidum, granulosum, spinosum, basale
○ B) Basale, spinosum, granulosum, lucidum, corneum
○ C) Basale, granulosum, spinosum, corneum, lucidum
○ D) Spinosum, basale, corneum, granulosum, lucidum
8. Keratinocytes are the predominant cell type of the epidermis. Their main structural role is to:
○ A) Secrete sebum to lubricate the skin surface
Page 3 of 23
