Quiz 5: Integumentary System Flashcards
What role does that Integumentary system play in the body?
1) Protection
2) Sensation
3) Thermoregulation
What are the three layers of the skin?
Epidermis, Dermis, Hypodermis
What layer is the epidermis
Outermost
What is the epidermis primarily composed of?
Keratinocytes which produce the protein keratin.
What does keratin do?
Makes our skin waterproof and provides protection against environmental hazards
Layers of the Epidermis
Stratum….
Corneum
Lucidum
Granolosum
Spinosum
Basale
Describe Stratum Corneum
Outermost layer of Epidermiscomprised of dead, flat cells filled with keratin. These cells are continuously shed and replaced by new cells from the deeper layers.
Describe Stratum lucidum
Present mainly in thick skin such as palms and soles
Describe Stratum Granulosum
-Cells begin to flatten out and lose their nucleus and organelles
- Water proof the skin
Describe Stratum Spinosum
- This layer of the epidermis consists of keratinocytes that are maturing and producing more and more keratin
Describe Stratum Basale
-The innermost layer where new skin cells form
- Melanocytes also found here
Where is melanin produced
- Stratum Basale
- Gives skin its color and offers protection against UV radiation
Describe the Dermis
-Thicker than epidermis
-Responsible for the skin’s elasticity and strength
- Rich in blood vessels, nerve endings, hair follicles and sweat glands
2 layers of the dermis
Papillary Region and Reticular region
Describe the Papillary Region
• Upper most part of dermis that contains thin collagen and elastin fibers.
- has finger-like projections called dermal papillae that interlaces with epidermis and provides it with nutrients and helps regulate temperature
Describe the Reticular Region
•deeper and thicker area of the dermis
- consists of dense irregular connective tissue containing thick collagen fibers which provides strength and elasticity of skin.
Collagen fibers
Predominant fibers in the dermis which provides strength and resilience
- makes up 70% of dermis and helps resist tearing and stretching
Elastic fibers
•allows skin to return to its original position after being stretched
Fibroblasts
Cells responsible for producing collagen and other fibers
Blood vessels
Nourish the skin and help in thermoregulation