ASU BIO 201 EXAM 2 QUESTIONS WITH
CORRECT ANSWERS 2025-2026
List terms synonymous with Skin - CORRECT ANSWER -123
Describe layers of skin - CORRECT ANSWER -There are two layers:
- Epidermis
- Dermis
What is Epidermus Layer? - CORRECT ANSWER -Outer layer of stratified squamous epithelium
What is Dermis Layer? - CORRECT ANSWER -Deeper connective tissue layer
• Compare thick and thin skin - CORRECT ANSWER -Thin skin: 0.5 - 1-2mm
Thick skin: up to 6mm
• Describe the epidermis in detail - CORRECT ANSWER -
Superficial to Dermis, Keritinized stratified squamous epithelium, NO BLOOD CELLS AVASCULAR.
• Describe the 5 zones/layers of the epidermis - CORRECT ANSWER -STRATUM:
Cornuem
Lucidum
Granulosum
Spinosum
Basale
• Explain the functions of different types of cells that reside in the various layers of the epidermis -
CORRECT ANSWER -
Basale: cells that divide quickly and produce tough fibrus protein filaments, sense touch.
Spinosum: THICKEST, cells alert immune system.
,Granulosum: - 3-5 layers of granule and vesicle and cells form protein-lipid epidermal water barrier.
Lucidum: THIN, cells are filed with eledin.
Cornuem: Dead, scaly keratinized cells.
• Describe the function of melanin - CORRECT ANSWER -PRODUCE PIGMENT
Melanin shapes and produces skill color, depending on Eumelanin and Pheomelanin produced in body.
• Describe how eumelanin and pheomelanin contribute to skin color - CORRECT ANSWER -
Eumelanin: black/brown
Pheomelanin: reddish/yellow
• Explain how the epidermal- water barrier is created and its function - CORRECT ANSWER -
It is created in Stratum Granulosom. forms a protein-lipid epidermal water barrier.
• Explain why epithelial cells get flat as they ascend toward the surface of the skin -
CORRECT ANSWER -They die as they get closer to the skin because they get cut off from nutrients.
• Explain the ecological role of dust mites in the environment - CORRECT ANSWER -
They feed off dead skin.
• Describe the dermis - CORRECT ANSWER -0.2-
4mm of fibrous connective tissue composed of collageen with elastic and reticular fibers.
• Define dermal papilla and piloerector muscles - CORRECT ANSWER -
Dermal Papillae: upward extensions of dermis into epidermous forming ridges.
Pilorector muscles: smooth muscle.
• Explain the roles of the two different types of connective tissues in the dermis - CORRECT ANSWER -
Papillary Layer: loose areolar tissue, to let WBC to move through.
Reticular Layer: dense irregular connective tissue responsible for connective tissue.
, • Describe the structure and function of the hypodermis - CORRECT ANSWER -
Structure: Subcutaneous tissue
Function: energy resevoir and thermal insulation.
• List terms that are synonymous with hypodermis - CORRECT ANSWER -Subcutaneous tissue
Superficial fascia.
• Recall the various pigments that can contribute to skin color - CORRECT ANSWER -Hemoglobin (red)
Carotene (yellow)
• Describe hemangiomas - CORRECT ANSWER -freckles and moles
• List seven abnormal skin colors and their causes - CORRECT ANSWER -skin colors:
Blue
red
yellw
golden-brown
pale
genetic lack of melanin
bruise
Abnormal Skin CAUSES - CORRECT ANSWER -Cyanosis
Erythma
Jaundice
Bronzing
Pallor
Albinism
Hematoma
CORRECT ANSWERS 2025-2026
List terms synonymous with Skin - CORRECT ANSWER -123
Describe layers of skin - CORRECT ANSWER -There are two layers:
- Epidermis
- Dermis
What is Epidermus Layer? - CORRECT ANSWER -Outer layer of stratified squamous epithelium
What is Dermis Layer? - CORRECT ANSWER -Deeper connective tissue layer
• Compare thick and thin skin - CORRECT ANSWER -Thin skin: 0.5 - 1-2mm
Thick skin: up to 6mm
• Describe the epidermis in detail - CORRECT ANSWER -
Superficial to Dermis, Keritinized stratified squamous epithelium, NO BLOOD CELLS AVASCULAR.
• Describe the 5 zones/layers of the epidermis - CORRECT ANSWER -STRATUM:
Cornuem
Lucidum
Granulosum
Spinosum
Basale
• Explain the functions of different types of cells that reside in the various layers of the epidermis -
CORRECT ANSWER -
Basale: cells that divide quickly and produce tough fibrus protein filaments, sense touch.
Spinosum: THICKEST, cells alert immune system.
,Granulosum: - 3-5 layers of granule and vesicle and cells form protein-lipid epidermal water barrier.
Lucidum: THIN, cells are filed with eledin.
Cornuem: Dead, scaly keratinized cells.
• Describe the function of melanin - CORRECT ANSWER -PRODUCE PIGMENT
Melanin shapes and produces skill color, depending on Eumelanin and Pheomelanin produced in body.
• Describe how eumelanin and pheomelanin contribute to skin color - CORRECT ANSWER -
Eumelanin: black/brown
Pheomelanin: reddish/yellow
• Explain how the epidermal- water barrier is created and its function - CORRECT ANSWER -
It is created in Stratum Granulosom. forms a protein-lipid epidermal water barrier.
• Explain why epithelial cells get flat as they ascend toward the surface of the skin -
CORRECT ANSWER -They die as they get closer to the skin because they get cut off from nutrients.
• Explain the ecological role of dust mites in the environment - CORRECT ANSWER -
They feed off dead skin.
• Describe the dermis - CORRECT ANSWER -0.2-
4mm of fibrous connective tissue composed of collageen with elastic and reticular fibers.
• Define dermal papilla and piloerector muscles - CORRECT ANSWER -
Dermal Papillae: upward extensions of dermis into epidermous forming ridges.
Pilorector muscles: smooth muscle.
• Explain the roles of the two different types of connective tissues in the dermis - CORRECT ANSWER -
Papillary Layer: loose areolar tissue, to let WBC to move through.
Reticular Layer: dense irregular connective tissue responsible for connective tissue.
, • Describe the structure and function of the hypodermis - CORRECT ANSWER -
Structure: Subcutaneous tissue
Function: energy resevoir and thermal insulation.
• List terms that are synonymous with hypodermis - CORRECT ANSWER -Subcutaneous tissue
Superficial fascia.
• Recall the various pigments that can contribute to skin color - CORRECT ANSWER -Hemoglobin (red)
Carotene (yellow)
• Describe hemangiomas - CORRECT ANSWER -freckles and moles
• List seven abnormal skin colors and their causes - CORRECT ANSWER -skin colors:
Blue
red
yellw
golden-brown
pale
genetic lack of melanin
bruise
Abnormal Skin CAUSES - CORRECT ANSWER -Cyanosis
Erythma
Jaundice
Bronzing
Pallor
Albinism
Hematoma
