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    Skin functions Skin functions Presentation Transcript

    • Skin Functions (pg 8)
    • Protection • Skin protects underlying tissue from mechanical, chemical, and thermal injury
    • Protection • Skin protects underlying tissue from mechanical, chemical, and thermal injury • Keratin waterproofs the cells, preventing fluid loss and gain through the skin
    • 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
    • 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
    • Sensory Reception • Dermis contains sense receptors for heat, cold, pain, touch, and pressure
    • Sensory Reception • Dermis contains sense receptors for heat, cold, pain, touch, and pressure • Receptors clustered around hair follicles can detect if the hair moves
    • Temperature Regulation Skin regulates body temperature in 2 ways: 1. Sweat glands 2. Dilation and constriction of blood vessels in the dermis
    • 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
    • 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
    • Synthesis of Vitamin D • Skin cells contain a precursor molecule that is converted to vitamin D when exposed to UV light
    • 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
    • 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
    • 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