Sponge: Set up Cornell Notes on pg. 50 Topic: Ch. 6 Integumentary System: Layers of the Skin Essential Question: 2.1 Atoms, Ions, and Molecules 6.3 Layers.

Sponge: Set up Cornell Notes on pg. 50

Topic: Ch. 6 Integumentary System: Layers of the Skin

Essential Question:

2.1 Atoms, Ions, and Molecules

6.3 Layers of the Skin

Split pg. 50 into 4 squares

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Epidermis Skin Layers

Video Notes

• 15 bullets

Tree Map: Epidermis and Dermis

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Layers of Skin

• 1. Epidermis

• 2. Dermis

•Subcutaneous layer or hypodermis• beneath dermis • NOT part of skin

The skin includes 2 distinct tissue layers:

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• Made up of stratified squamous epithelium• Lacks blood vessels• is nourished by dermal blood vessels

• As new cells grow- • push old cells farther from nutrient supply and they

die• Become keratinized- hardens, becomes waterproof• Eventually shed

Epidermis

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• 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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Epidermis

Layers of Epidermis• stratum corneum• stratum lucidum• stratum granulosum• stratum spinosum• stratum basale

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• 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

Dermis

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Tattoos

• Ink injected into the dermis• Color is permanent• Dermis cells are not shed!

Tattoo Removal• Lasers shatters ink

molecules• Immune system removes

debris• Before lasers, tattoos were

scraped, frozen, or cut away

• PAINFUL!!!!!

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Video:

The Tattoo Removal Process

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Subcutaneous Layer

Composed of:

• loose connective tissue

• adipose tissue• major blood vessels

• NOT part of the skin• Binds the skin to underlying organs• Insulates

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Got Cellulite?

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Video:

The Layers of the Human Skin

• Please add information to your pictures from the video

-Layer of dead fat tissue