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Bellwork. Do you think the skin is an organ? Explain your answer. Bellwork. YES! An organ is a group of tissues working together for a specific function, therefor skin is an organ. The skin and it’s various accessory structures make up the……. Integumentary System. Chapter 4. Functions.

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bellwork
Bellwork
  • Do you think the skin is an organ? Explain your answer.
bellwork1
Bellwork
  • YES! An organ is a group of tissues working together for a specific function, therefor skin is an organ.
  • The skin and it’s various accessory structures make up the……
functions
Functions
  • Prevents harmful substances from entering body
    • Bacteria, UV radiation, chemicals
  • Prevents too much water loss
  • Regulates body temperature
  • Produces vitamin D
skin and it s tissues
Skin and it’s tissues
  • Two distinct layers:
    • Cutaneous: (THIS IS YOUR SKIN)
      • Epidermis (outer): stratified squamous epithelial tissue
      • Dermis: (inner): connective tissue, smooth muscle, nervous tissue
    • Subcutaneous: (THIS IS BELOW YOUR SKIN)
      • Areolar and adipose tissue
      • Contains major blood vessels to supply the skin
questions
Questions
  • 1. What kind of tissue is the outer layer of skin made of?
  • 2. What kind of tissues is the inner layer of skin made of?
epidermis1
Epidermis
  • Stratum corneum: dead keratinized cells
  • Stratum lucidum: only present in palms and soles of feet
  • Stratum granulosum: cells die
  • Stratum spinosum: keratin fibers accumulate
  • Stratum basale: cells divide and grow
question
Question
  • Explain how the epidermis is formed.
epidermis2
Epidermis
  • Melanocytes: cells that produce the dark pigment melanin
  • Melanin absorbs UV radiation which would otherwise cause mutations in DNA
slide11
Poll
  • Do you think African Americans have more melanocytes than Caucasions?
    • Answer: They all have the SAME! The difference in color of skin has to do with the amount of melanin those cells produce.
epidermis3
Epidermis
  • Sunlight and tanning beds stimulate melanocytes to produce more melanin and we get darker!
  • Other factors in color of skin:
    • Blood oxygen levels
    • Blood vessel dilation (when embarassed, overheated, or intoxicated you get red; when cold or afraid you get pale)
questions1
Questions
  • 1. What is the function of melanin
  • 2. How do physiological factors influence skin color?
dermis
Dermis
  • Papillary layer – areolar connective tissue
  • Reticular layer – dense irregular connective tissue

Can be as thin as 0.5 mm on the eyelids or as thick as 3 mm on the bottom of feet!

dermis1
Dermis
  • Also contains muscle fibers and dendrites (part of the neuron that picks up signal)
  • Accessory structures:
    • Blood vessels, hair follicles, sebaceous glands, sweat glands
exit ticket
Exit Ticket
  • Given what you learned today about the epidermis and the dermis, where do you think the ink in a tattoo lies? Explain your answer.
slide17

http://media.pearsoncmg.com/bc/bc_marieb_happlace_7/labeling/fig_0501.htmlhttp://media.pearsoncmg.com/bc/bc_marieb_happlace_7/labeling/fig_0501.html

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