Sponge: Set up Cornell Notes on pg. 50 Topic: Ch Sponge: Set up Cornell Notes on pg. 50 Topic: Ch. 6 Integumentary System: Layers of the Skin Essential Question: 6.3 Layers of the Skin 2.1 Atoms, Ions, and Molecules
Split pg. 50 into 4 squares Epidermis Skin Layers Video Notes 15 bullets Tree Map: Epidermis and Dermis
Layers of Skin 1. Epidermis 2. Dermis Subcutaneous layer or hypodermis The skin includes 2 distinct tissue layers: 1. Epidermis 2. Dermis Subcutaneous layer or hypodermis beneath dermis NOT part of skin
Epidermis 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
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?)
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
Epidermis Layers of Epidermis stratum corneum stratum lucidum stratum granulosum stratum spinosum stratum basale
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
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!!!!!
Video: The Tattoo Removal Process
Subcutaneous Layer NOT part of the skin Binds the skin to underlying organs Insulates Composed of: loose connective tissue adipose tissue major blood vessels
Got Cellulite?
Please add information to your pictures from the video The Layers of the Human Skin Please add information to your pictures from the video -Layer of dead fat tissue