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The skin is divided into what two layer?
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epidermis
- thin, superficial layer
- outermost protective layer of the skin
- composed of squamous (scaly) epithelium, stratified into several layers
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innermost layer of the epidermis is composed of:
living cells and is called the strtum basale.
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Dermis:
- thicker layer
- composed entirely of live cells
- contains blood and lymph vessels, nerves, hair follicles, sweat glands and oil glands
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Subcutaneous tissue
- layer beneath the dermnis and on top of a layer of muscle.
- specializes in the formation and storage of lipocytes
- cushions and protects underlying areas.
- serves as a heat insulator
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skin color
- combination of three pigments:
- melanin
- carotene
- hemoglobin
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melanin
brown-black pigment produced by melanocytes, found mostly in the basal layer of the epidermis
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carotene
a yellowish pigment found in parts of the epidermis and dermis.
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Normal temp:
- 98.6 degrees F
- 37 degrees C
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Hair
- protects hair shaft (dead) outer part
- around root is hair follicle
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arrector pili
- stimulated by cold or fear
- these muscles contract making the hair stand erect.
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Nails:
tightly packed epidermis cells
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Nail matrix
where nail grows
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lunula
white bc air has mixed w the keratin
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Sebaceous gland
oil gland that produces sebum
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sudoriferous gland
sweat glands
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apocrine
become active during puberty, secreting a milky sweat into the hair follicle.
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