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Published byHannah Perkins Modified over 9 years ago
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Structure of the Skin Notes EQ: Describe the three layers of the skin. EQ: Identify and locate accessory structures of the skin.
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Skin Facts Largest organ in the body. Most of the dust in your home is really dead skin. Skin accounts for about 15% of your body weight. You grow a completely new layer of skin every 28 days. Over 1000 species of bacteria are naturally found on human skin.
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Layers of the Skin Cutaneous membrane Epidermis + dermis
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Layers of the Skin Epidermis mostly dead cells Thick skin – 5 layers; hands and feet Thin skin – 4 layers; everywhere else Melanocyte – produce skin pigment (melanin)
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Squamous epithelium
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Layers of the Skin Dermis Living cells Nerves, blood vessels, glands, collagen and elastin
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Dermal Tissue
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Layers of the Skin Hypodermis (subcutaneous layer) Mostly adipose (fat) tissue Hair follicles
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Hypodermal Cells
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Accessory Structures of the Skin A – hair shaft B – sebaceous gland –Produce sebum –Lubricate hairs –Antibacterial C – hair follicle
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Acne Formation
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Accessory Structures of the Skin D – arrector pili muscle –Make hair stand up E – sweat gland –Homeostasis - as sweat evaporates, it cools the body –Body odor
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Accessory Structures of the Skin F – blood vessel –Bring nutrients to skin cells –Homeostasis – warms the skin G – nerve receptor –Touch –Pain –pressure
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Functions of the Skin Notes EQ: What are the functions of the skin in the human body?
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Recurring Theme Homeostasis –Means “steady state” –The body has mechanisms to keep its internal conditions the same when the environment changes
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Function of Epidermis Protection –Bacteria –Dirt –Minor wounds Melanocytes –Protection from UV
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Function of Dermis Makes skin elastic and tough –Collagen –Elastin –Fibrillin Homeostasis – “goose bumps” caused by arrector pili muscles create insulation
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Function of Hypodermis Insulation Padding Energy storage
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Functions of Accessory Structures Hair –Homeostasis - warmth –Touch sensitivity –Protection from injury Melanocyte –Produces melanin –Protects from UV rays
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