BIO 201 -ASU Exam 2-Questions and
Already Solved Solutions Graded A+.
List terms synonymous with Skin - Answer 123
Describe layers of skin - Answer There are two layers:
- Epidermis
- Dermis
What is Epidermus Layer? - Answer Outer layer of stratified squamous epithelium
What is Dermis Layer? - Answer Deeper connective tissue layer
• Compare thick and thin skin - Answer Thin skin: 0.5 - 1-2mm
Thick skin: up to 6mm
• Describe the epidermis in detail - Answer Superficial to Dermis, Keritinized stratified
squamous epithelium, NO BLOOD CELLS AVASCULAR.
• Describe the 5 zones/layers of the epidermis - Answer STRATUM:
Cornuem
Lucidum
Granulosum
Spinosum
Basale
• Explain the functions of different types of cells that reside in the various layers of the
epidermis - 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 - 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 - Answer Eumelanin:
black/brown
Pheomelanin: reddish/yellow
• Explain how the epidermal- water barrier is created and its function - 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 - 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 - Answer They feed off dead
skin.
• Describe the dermis - Answer 0.2-4mm of fibrous connective tissue composed of collageen
with elastic and reticular fibers.
• Define dermal papilla and piloerector muscles - 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 - 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 - Answer Structure: Subcutaneous
tissue
Function: energy resevoir and thermal insulation.
• List terms that are synonymous with hypodermis - Answer Subcutaneous tissue
Superficial fascia.
• Recall the various pigments that can contribute to skin color - Answer Hemoglobin (red)
Carotene (yellow)
• Describe hemangiomas - Answer freckles and moles
Already Solved Solutions Graded A+.
List terms synonymous with Skin - Answer 123
Describe layers of skin - Answer There are two layers:
- Epidermis
- Dermis
What is Epidermus Layer? - Answer Outer layer of stratified squamous epithelium
What is Dermis Layer? - Answer Deeper connective tissue layer
• Compare thick and thin skin - Answer Thin skin: 0.5 - 1-2mm
Thick skin: up to 6mm
• Describe the epidermis in detail - Answer Superficial to Dermis, Keritinized stratified
squamous epithelium, NO BLOOD CELLS AVASCULAR.
• Describe the 5 zones/layers of the epidermis - Answer STRATUM:
Cornuem
Lucidum
Granulosum
Spinosum
Basale
• Explain the functions of different types of cells that reside in the various layers of the
epidermis - 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 - 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 - Answer Eumelanin:
black/brown
Pheomelanin: reddish/yellow
• Explain how the epidermal- water barrier is created and its function - 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 - 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 - Answer They feed off dead
skin.
• Describe the dermis - Answer 0.2-4mm of fibrous connective tissue composed of collageen
with elastic and reticular fibers.
• Define dermal papilla and piloerector muscles - 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 - 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 - Answer Structure: Subcutaneous
tissue
Function: energy resevoir and thermal insulation.
• List terms that are synonymous with hypodermis - Answer Subcutaneous tissue
Superficial fascia.
• Recall the various pigments that can contribute to skin color - Answer Hemoglobin (red)
Carotene (yellow)
• Describe hemangiomas - Answer freckles and moles
