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21 Cards in this Set
- Front
- Back
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What are the components of the integumentary system?
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skin, hair, nails, and glands
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What are the 5 functions of the integumentary system?
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1. protection - water loss, microbes, UV light (1st line of defense)
2. sensation - hot, cold , pain, pressure 3. temperature regulation- helps maintain homeostasis 4. excretion - removes waste, keeps hyrated, oils, water/cooling 5. vitamin D production - UV light stimulates production |
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The hair protections the body from what?
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soft blows to the head
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What are the 3 main regions of the skin?
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epidermis and dermis , the hypodermins/subcutaneous is below
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where you find adipose tissue used for temperature regulation and cushion
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subcutaneous layer
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What are the 5 layers of the epidermis?
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1. stratum corneum
2. stratum lucidim ( only found on the palms and solves ; transparent layer of the skin, very thin) 3. stratum granulosum 4. stratum spinoum 5. stratum basale |
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What are the 2 living layers of the epidermis?
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stratum spinosum and stratum basale ( two bottom layers where mitosis occurs)
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1st major skin region (outside), composed of stratified squamous eoptihelium , hardened dead cells which went through keratinization
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epidermis
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process in which new cells (with keratin) push old cells to surface ; 40-56 days for new cells to reach surface
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keratinization
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outermost layer of epidermis ; 20-30 layers of dead squamous cells filled with keratin ; accounts for 75% of epidermal thickness ; dandruff is this layer flaking off scalp
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stratum corneum
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forms when stratum corneum has frequent friction
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callus
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deepest layer of epidermis; single layer of cells ; firmly attached to dermis
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stratum basale
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2nd major skin region; dense connective tissue, contains collagen and elastic fibers; contains fibroblasts, nerve endings, smooth muscle, glands, blood vessels, and hair follicles
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dermis
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area where skin is most resistant to stretching, due to orientation of collagin fibers, important in scarring
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cleavage lines
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What are the layers of the dermis?
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papillary layer and reticular layer
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thin connective tissue layer that contains blood vessels
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papillary layer
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projections that extend up into the epidermis, remove waste and help to regulate body temp. , ridged on hands and feet (fingerprints), pattern is genetically determined, upper most layer of the dermis?
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dermal papillae
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deepest layer of the dermis, accounts for 80% of the dermis
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reticular layer
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below dermis, foundation of skin, attaches skin to underlying muscle and bone, contains loose and adipose tissue , contains 1/2 of body's fat, body fat for females 20-23% , males 13-25%
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hypodermis or subcutaneous layer
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How are skin color and its variations determined?
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pigments, genetics, blood circulation, and thickness of stratum corneum
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________ of darker skinned people produce move
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melanocytes
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