Transcript Layers of skin - cloudfront.net

Sponge: Set up Cornell
Notes on pg. 43
Topic: Ch. 6 Integumentary
System: Layers of the Skin
Essential Question: If skin
cells are constantly dying
and shedding, how come a
tattoo does not eventually
shed off?
6.3 Ions,
Layers of the Skin
2.1 Atoms,
and Molecules
If skin cells are constantly dying and shedding, how
come a tattoo does not eventually shed off?
Send someone up for
the journal writing
prompt:
Due TOMORROW
Got Extra Credit?
•
•
•
•
Come to Report Card Night
This Thursday
2:00-4:00
5:30-8:00
Layers of Skin
The skin includes 2 distinct tissue layers:
• 1. Epidermis
• 2. Dermis
•Subcutaneous layer
or hypodermis
• beneath dermis
• NOT part of skin
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Epidermis
• Made up of stratified squamous epithelium
• Lacks blood vessels
• is nourished by dermal blood vessels
4
Epidermis
• As new cells grow• push old cells farther from nutrient supply and they
die
• Become keratinized- hardens, becomes waterproof
• Eventually shed
5
• Thickest on palms and soles of feet
• Thin everywhere else (0.07-0.12mm thick)
• Cell division is higher in areas where skin is rubbed or
pressed regularly (Hypothesize why?)
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• Melanocytes- specialized cells
that produce the dark pigment
melanin
• Provides skin color
• Absorbs UV rays
• Prevents mutations in the DNA
or skin cells and other
damaging effects
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Layers of Epidermis
• stratum corneum
• stratum lucidum
• stratum granulosum
• stratum spinosum
• stratum basale
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Dermis
• Binds epidermis to underlying tissues
• on average 1.0-2.0mm thick
Composed of:
• irregular dense connective
tissue
• muscle cells
• nerve cell processes
• specialized sensory
receptors
• blood vessels
• hair follicles
• glands
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Tattoos
• Ink injected into the dermis
• Color is permanent
• Dermis cells are not shed!
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Tattoo Removal
Lasers shatters ink
molecules
Immune system removes
debris
Before lasers, tattoos were
scraped, frozen, or cut
away
PAINFUL!!!!!
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The Tattoo Removal Process
3m20s
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Subcutaneous Layer
• NOT part of the skin
• Binds the skin to underlying organs
• Insulates
Composed of:
• loose connective
tissue
• adipose tissue
• major blood vessels
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Got Cellulite?
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Layers of skin
The Layers of the Human Skin
The Human Skin Animation
3m47s
1m7s
• Make a picture bubble Map
• Add information from the video into your
pictures of the layers of the skin
-Layer of dead fat tissue
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P. 40
Classwork/Homework
Using the Homeostatic response sheet on Pg. 12…
• Task: Write a two-three paragraph journal entry on either
hyperthermia OR hypothermia.
• Pretend you are someone suffering from hypothermia or hyperthermia.
Please write two-three paragraphs describing your circumstances and the
effects hyperthermia or hypothermia is having on your body. Make sure to
include these details:
•
Where are you?
•
What are the circumstances that led you to this fate? (Backstory)
•
Explain in detail the physical effects that you are experiencing.
DUE: Tomorrow
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