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Bellringer : What is the largest organ of your body? What system is it part of? Write your answer down on a fresh sheet of paper or notetaking device!. http:// www.youtube.com / watch?v =uH_uzjY2bEE. Integumentary System. Integument- “covering” Parts: Skin Sweat and oil glands Hair Nails.

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  1. Bellringer: What is the largest organ of your body? What system is it part of? Write your answer down on a fresh sheet of paper or notetaking device!

  2. http://www.youtube.com/watch?v=uH_uzjY2bEE

  3. Integumentary System • Integument- “covering” • Parts: • Skin • Sweat and oil glands • Hair • Nails

  4. Functions?

  5. Fun Facts • Skin = 7% of your total body weight • ~80% of dust in your home is dead skin cells • More than 500 species of bacteria living on your skin • 1.5-4 mm thick

  6. 3 Main Layers

  7. Epidermis • Epi= upon • Dermis = skin • Tough but loosely anchored • New cells created deep • Mostly dead • “Beauty is only skin deep” ?! • 5 layers

  8. 4 Important Cells: • Keratinocytes • Produce protein keratin which gives skin protective qualities • Melanocytes • Produce melanin (nucleus umbrellas!) • Langerhans • Phagocytes • Merkelcells • Sensory cell

  9. Stratum Basale“Basal Layer” • Deepest • Produces keratinocytes • Mitosis hotspots • Merkel hangout

  10. Stratum Spinosum“Prickly Layer” • Funny shaped keratinocytes • Langerhan hangout • Tension-resisting

  11. Stratum Granulosum“Granular Layer” • 3-5 cell layers thick • Waterproofing • Cell death line

  12. Stratum Lucidum“Clear Layer” • Only in thick skin • Just a few rows of dead keratinocytes

  13. Stratum Corneum“Horny Layer” • 20-30 dead cells thick • 75% of epithelial thickness • Protects against abrasion and penetration FULL OF HORNY CELLS (they’re shaped like horns)

  14. Activities! • Color the different layers of the epithelium • Draw pictures of each cell type and epithelial layer using a microscope

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