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Skin Sara Hurtuk


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SKIN Presentation by Sara Hurtuk

Published in: Health & Medicine, Lifestyle
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Skin Sara Hurtuk

  1. 1. SKIN Presented by Sara Hurtuk
  2. 2. SKIN FUNCTIONS <ul><li>Protection from infections, hot/cold, sun, chemicals, water loss </li></ul><ul><li>Regulates our body temperature </li></ul><ul><li>Sensations of touch, pain, hot/cold </li></ul><ul><li>Produces Vitamin D </li></ul><ul><li>It gives us our appearance and shape </li></ul>
  3. 3. SKIN <ul><li>Skin is the largest organ of the body and is composed of three layers (moving from out to in): </li></ul><ul><li>1.) Epidermis </li></ul><ul><li>2.) Dermis </li></ul><ul><li>3.) The subcutaneous layer </li></ul>
  4. 5. EPIDERMIS <ul><li>(Does not have a direct blood supply, all nutrients come from the dermis.) </li></ul><ul><li>Composed of stratified squamous epithelium (flat scale-like cells that overlap layers) </li></ul>
  5. 6. EPIDERMIS CONT. <ul><li>The basal layer has special cells called melanocytes the produce black pigment called melanin . </li></ul><ul><li>Melanin is responsible for the color of skin and protects against UV rays. </li></ul>The deepest layer is the basal layer . This is the layer that pushes old cells towards the outer layer. -When the old cells are pushed out, they shrink die and become filled with a hard protein called keratin . -The dead cells allow the skin to act as an effective barrier to infection and make it waterproof.
  6. 7. DERMIS <ul><li>The middle layer of skin located between the epidermis and subcutaneous layer. Also known as the corium </li></ul><ul><li>The dermis contains living tissue and has a blood supply </li></ul><ul><li>Composed of connective tissue called collagen fibers </li></ul>Collagen fibers are formed by strong fibrous protein that gives the connective tissue strength.
  7. 8. DERMIS CONT. <ul><li>The dermis contains the following cells and structures: </li></ul><ul><li>Hair follicles </li></ul><ul><li>Sebaceous (oil) glands & apocrine (scent) glands </li></ul><ul><li>Sweat glands </li></ul><ul><li>Blood vessels and nerves </li></ul>
  8. 9. THE SUBCUTANEOUS LAYER <ul><li>The deepest layer of skin, also known as hypodermis . </li></ul><ul><li>Composed mostly of lipocytes or fat cells </li></ul><ul><li>Protects the deeper tissue </li></ul><ul><li>Acts as insulation for heat and cold. </li></ul>
  9. 10. FUN FACTS ABOUT SKIN <ul><li>The average adult’s skin spans 21 sq. ft.; weighs 9 lbs., and contains more than 11 miles of blood vessels </li></ul><ul><li>We shed about 600,000 old dead skins cells in an hour or about 1.5 pounds a year. </li></ul><ul><li>By the time a person reaches 70 years old, they will have lost 105 lbs. of skin in their lifetime. </li></ul>