Skin functions

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Skin functions

  1. 1. Skin Functions (pg 8)
  2. 2. Protection • Skin protects underlying tissue from mechanical, chemical, and thermal injury
  3. 3. Protection • Skin protects underlying tissue from mechanical, chemical, and thermal injury • Keratin waterproofs the cells, preventing fluid loss and gain through the skin
  4. 4. Protection • Skin protects underlying tissue from mechanical, chemical, and thermal injury • Keratin waterproofs the cells, preventing fluid loss and gain through the skin • Skin provides the first line of defense against bacteria and other pathogens
  5. 5. Protection • Skin protects underlying tissue from mechanical, chemical, and thermal injury • Keratin waterproofs the cells, preventing fluid loss and gain through the skin • Skin provides the first line of defense against bacteria and other pathogens • Melanin absorbs UV light
  6. 6. Sensory Reception • Dermis contains sense receptors for heat, cold, pain, touch, and pressure
  7. 7. Sensory Reception • Dermis contains sense receptors for heat, cold, pain, touch, and pressure • Receptors clustered around hair follicles can detect if the hair moves
  8. 8. Temperature Regulation Skin regulates body temperature in 2 ways: 1. Sweat glands 2. Dilation and constriction of blood vessels in the dermis
  9. 9. Negative Feedback Blood vessels dilate Sweat glands become active Body temp rises Above normal Body heat is lost to surroundings And body temperature decreases Normal Body Tempature 98.6 F
  10. 10. Negative Feedback Blood vessels dilate Sweat glands become active Body temp rises Above normal Body heat is lost to surroundings And body temperature decreases Normal Body Tempature 98.6 F Body heat is conserved And body temperature increases Body temp falls below normal Blood vessels constrict Sweat glands become inactive
  11. 11. Synthesis of Vitamin D • Skin cells contain a precursor molecule that is converted to vitamin D when exposed to UV light
  12. 12. Synthesis of Vitamin D • Skin cells contain a precursor molecule that is converted to vitamin D when exposed to UV light • Vitamin D is essential for bone mineralization
  13. 13. Synthesis of Vitamin D • Skin cells contain a precursor molecule that is converted to vitamin D when exposed to UV light • Vitamin D is essential for bone mineralization • Limited sun exposure can lead to vitamin D deficiency, which can result in osteoporosis and other chronic disorders
  14. 14. Output (pg 9) • Write a song about the functions of the skin • Must be at least 10 lines long • Give the song a title and say what it is to the tune of

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