The skin

  1. What are 6 functions of the skin?
    • protection 
    • sensory perception 
    • thermoregulation 
    • excretion of small amounts of water and body waste.
    • maintenance of bones and teeth (synthesis of vit D) 
    • absorbs fat soluble vitamins and drugs through the skin
  2. What are the 3 layers of skin?
    • Epidermis 
    • Dermis 
    • Hypodermis (subcutaneous layer)
  3. What is the most outer layer of the skin?
  4. What are the two main layers of the epidermis?
    • Keratin 
    • Melanocytes
  5. what does the keratin layer do in the epidermis?
    • tough and fibrous protein 
    • contributes to skin colour and protects heat and foreign material
  6. What does the melanocytes do in the epidermis?
    • Produces melanin
    • contributes to skin colour and protects against UV rays
  7. What passes through the epidermis?
    • Hair 
    • sebaceous glands 
    • ducts of sweat glands
  8. what is the epidermis attached to?
    attached to dermal layer by upward projections.
  9. What is the deepest layer of the skin?
  10. What does the dermis provide?
    Strength and pliability
  11. What are the sensory perceptions of the dermis?
    • pain 
    • pressure 
    • temperature
  12. What does the dermis consist of?
    • Connective tissue 
    • elastin
    • extracellular matrix
  13. What does the dermis contains?
    • blood vessels 
    • lymphatic vessels 
    • nerve fibres 
    • hair follicles 
    • sweat glands 
    • sebaceous glands release sebum
  14. What do the sweat glands do?
    helps regulate body temp
  15. What do the sebaceous glands?
    release sebum (oily antimicrobial substance) into the hair follicles to provide moisture and some water proofing for the skin
  16. What does the subcutaneous do?
    • helps insulate the body 
    • absorbs shock to the skeletal system 
    • allows skin to move easily over underlying structures
  17. What does the subcutaneous consist of?
    • subcutaneous fat 
    • connective tissue 
    • sweat glands
  18. What are the effects of age on the skin?
    • dermis and epidermis become thinner 
    • reduced elasticity 
    • efficiency of temp regulation decreases 
    • reduced sebum secreted onto the skin resulting in dry skin 
    • Vit D production decreases resulting in reduced bone strength
    • melanocytes (producing melanin) become less active resulting in increased likelihood of sunburn
Card Set
The skin