BIOL251 / BIOL 251 Module & Lab 3 Human Anatomy
& Physiology I with Lab – Complete Study Guide
EXAM INFORMATION
| Component | Details |
|--||
| Course | BIOL251 / BIOL 251 – Human Anatomy & Physiology I with Lab |
| Institution | Portage Learning |
| Module | Module & Lab 3 |
| Latest Update | 2025/2026 |
| Grade | A+ (100% Correct) |
TABLE OF CONTENTS
1. Module 3: The Integumentary System – Questions 1-25
2. Module 3: Bone Tissue & Skeletal System – Questions 26-50
3. Module 3: Joints & Articulations – Questions 51-65
4. Lab 3: Microscopic Anatomy & Tissue Identification – Questions 66-80
5. Quick Reference Answer Key
SECTION 1: INTEGUMENTARY SYSTEM (Questions 1-25)
Question 1
What are the three main layers of the skin?
Answer: Epidermis, Dermis, Hypodermis (Subcutaneous layer)
Rationale: The skin consists of the outer epidermis (epithelial tissue), the underlying dermis
(connective tissue), and the hypodermis (subcutaneous tissue, not technically part of the skin
but anchoring it to underlying structures).
,Question 2
What type of epithelium makes up the epidermis?
Answer: Stratified squamous epithelium
Rationale: The epidermis is composed of stratified squamous epithelium, which provides
protection against abrasion, pathogens, and water loss. The superficial layers are keratinized
(dead cells filled with keratin).
Question 3
Name the five layers (strata) of the epidermis from deep to superficial.
Answer: Stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, stratum
corneum
Rationale: The five strata in order: basale (germinative layer), spinosum (prickle cell layer),
granulosum (keratohyalin granules), lucidum (only in thick skin), corneum (dead keratinized
cells).
Question 4
Which layer of the epidermis is only found in thick skin (palms and soles)?
Answer: Stratum lucidum
Rationale: The stratum lucidum is a clear, translucent layer found only in thick skin such as the
palms of the hands and soles of the feet.
Question 5
What is the most abundant cell type in the epidermis?
Answer: Keratinocytes
Rationale: Keratinocytes make up approximately 90-95% of epidermal cells and produce
keratin, a tough fibrous protein that provides protection and waterproofing.
, Question 6
What cells produce melanin and where are they located?
Answer: Melanocytes, located in the stratum basale
Rationale: Melanocytes are found in the stratum basale and produce melanin, the pigment
responsible for skin, hair, and eye color. Melanin protects against UV radiation.
Question 7
What are Langerhans cells?
Answer: Immune cells (dendritic cells) in the epidermis that participate in immune surveillance
Rationale: Langerhans cells are dendritic cells found in the stratum spinosum. They phagocytize
pathogens and present antigens to T cells, acting as antigen-presenting cells.
Question 8
What are Merkel cells?
Answer: Touch receptors located in the stratum basale
Rationale: Merkel cells are mechanoreceptors associated with sensory nerve endings. They are
responsible for light touch sensation.
Question 9
What is the primary tissue type found in the dermis?
Answer: Dense irregular connective tissue
Rationale: The dermis is composed of dense irregular connective tissue containing collagen and
elastin fibers, which provide strength, elasticity, and resilience.
& Physiology I with Lab – Complete Study Guide
EXAM INFORMATION
| Component | Details |
|--||
| Course | BIOL251 / BIOL 251 – Human Anatomy & Physiology I with Lab |
| Institution | Portage Learning |
| Module | Module & Lab 3 |
| Latest Update | 2025/2026 |
| Grade | A+ (100% Correct) |
TABLE OF CONTENTS
1. Module 3: The Integumentary System – Questions 1-25
2. Module 3: Bone Tissue & Skeletal System – Questions 26-50
3. Module 3: Joints & Articulations – Questions 51-65
4. Lab 3: Microscopic Anatomy & Tissue Identification – Questions 66-80
5. Quick Reference Answer Key
SECTION 1: INTEGUMENTARY SYSTEM (Questions 1-25)
Question 1
What are the three main layers of the skin?
Answer: Epidermis, Dermis, Hypodermis (Subcutaneous layer)
Rationale: The skin consists of the outer epidermis (epithelial tissue), the underlying dermis
(connective tissue), and the hypodermis (subcutaneous tissue, not technically part of the skin
but anchoring it to underlying structures).
,Question 2
What type of epithelium makes up the epidermis?
Answer: Stratified squamous epithelium
Rationale: The epidermis is composed of stratified squamous epithelium, which provides
protection against abrasion, pathogens, and water loss. The superficial layers are keratinized
(dead cells filled with keratin).
Question 3
Name the five layers (strata) of the epidermis from deep to superficial.
Answer: Stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, stratum
corneum
Rationale: The five strata in order: basale (germinative layer), spinosum (prickle cell layer),
granulosum (keratohyalin granules), lucidum (only in thick skin), corneum (dead keratinized
cells).
Question 4
Which layer of the epidermis is only found in thick skin (palms and soles)?
Answer: Stratum lucidum
Rationale: The stratum lucidum is a clear, translucent layer found only in thick skin such as the
palms of the hands and soles of the feet.
Question 5
What is the most abundant cell type in the epidermis?
Answer: Keratinocytes
Rationale: Keratinocytes make up approximately 90-95% of epidermal cells and produce
keratin, a tough fibrous protein that provides protection and waterproofing.
, Question 6
What cells produce melanin and where are they located?
Answer: Melanocytes, located in the stratum basale
Rationale: Melanocytes are found in the stratum basale and produce melanin, the pigment
responsible for skin, hair, and eye color. Melanin protects against UV radiation.
Question 7
What are Langerhans cells?
Answer: Immune cells (dendritic cells) in the epidermis that participate in immune surveillance
Rationale: Langerhans cells are dendritic cells found in the stratum spinosum. They phagocytize
pathogens and present antigens to T cells, acting as antigen-presenting cells.
Question 8
What are Merkel cells?
Answer: Touch receptors located in the stratum basale
Rationale: Merkel cells are mechanoreceptors associated with sensory nerve endings. They are
responsible for light touch sensation.
Question 9
What is the primary tissue type found in the dermis?
Answer: Dense irregular connective tissue
Rationale: The dermis is composed of dense irregular connective tissue containing collagen and
elastin fibers, which provide strength, elasticity, and resilience.
