Bellwork
Download
1 / 17

Bellwork - PowerPoint PPT Presentation


  • 127 Views
  • Uploaded on

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.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Bellwork' - saima


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
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


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.



ad