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BGY 32

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Amber Dowdy

on 2 February 2011

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Transcript of BGY 32

SKIN covers & protects
body 4 types of tissues:
1.) epithelial
2.) connective
3.) muscle
4.) nerve epidermis: outer layer of skin keratin: waterproofsand protects cells dead cells are shed,
dust, entire skin layer
can be shed in one month melanin: pigment that absorbs light energy dermis is below epidermis usually 15-40 x thicker
than dermis Made up of connective tissues which allow it to return to normal state after being stretched. hair and nails = keratin hairs grow out of narrow cavities = hair follicles Sebaceous glands: lubricate skin and hair When glands produce too much oil, they can bc blocked...acne Functions of integumnetary system:

1.) Temperature regulation
2.) Vitamin production
3.) Protection
4.) Senses goose bumps: contraction of muscle cells in dermis Humans rely on fat to
keep them warm, but
many animals do. rely on hair skin produces vitamin D Receptors found in skin:
*Environmental changes Skin can repair
itself. Blood flows out of a wound until a clot forms. Blood clots form a scab to close the wound. As people age, the elasticity of their skin
decreases and wrinkles form. Burns ~ classified by severity.
Caused by sun, heat or chemicals First degree: cells in epidermis may die,
redness and pain, mild swelling second degree: cells in
deeper epidermis die, cells in dermis also are injured or die. Blisters or pain. third degree: cells in
dermis and epidermis die.
Nerve cells and muscles
are injured. Skin funtion is lost, healthy skin needs to be replaced. No pain bc nerve cell destroyed. Usually have 1st and 2nd degree burns with 3rd. skin cancer: most common cancer in US Two main types:
*nonmelanoma Melanoma is deadliest can spread to internal organs. One person dies every hour in US from this cancer. Chance of skin cancer increase if you have light colored skin, light eye color, and tendancy to burn or freckle.
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