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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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Youtube watch v uh uzjy2bee

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!


Youtube watch v uh uzjy2bee

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


Integumentary system

Integumentary System

  • Integument- “covering”

  • Parts:

    • Skin

    • Sweat and oil glands

    • Hair

    • Nails


Functions

Functions?


Fun facts

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


Youtube watch v uh uzjy2bee

3 Main Layers


Epidermis

Epidermis

  • Epi= upon

  • Dermis = skin

  • Tough but loosely anchored

  • New cells created deep

  • Mostly dead

    • “Beauty is only skin deep” ?!

  • 5 layers


4 important cells

4 Important Cells:

  • Keratinocytes

    • Produce protein keratin which gives skin protective qualities

  • Melanocytes

    • Produce melanin (nucleus umbrellas!)

  • Langerhans

    • Phagocytes

  • Merkelcells

    • Sensory cell


Stratum basale basal layer

Stratum Basale“Basal Layer”

  • Deepest

  • Produces keratinocytes

  • Mitosis hotspots

  • Merkel hangout


Stratum spinosum prickly layer

Stratum Spinosum“Prickly Layer”

  • Funny shaped keratinocytes

  • Langerhan hangout

  • Tension-resisting


Stratum granulosum granular layer

Stratum Granulosum“Granular Layer”

  • 3-5 cell layers thick

  • Waterproofing

  • Cell death line


Stratum lucidum clear layer

Stratum Lucidum“Clear Layer”

  • Only in thick skin

  • Just a few rows of dead keratinocytes


Stratum corneum horny layer

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)


Activities

Activities!

  • Color the different layers of the epithelium

  • Draw pictures of each cell type and epithelial layer using a microscope


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