Integumentary system

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  • Created by: AmberJ1
  • Created on: 29-04-17 14:40
whats another name for the skin?
cutaneous membrane
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true or false, the skin is the the largest organ but 2nd heaviest
true
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what are the 3 layers of the skin in order?
epidermis, dermis and subcutaneous
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what is the epidermis?
the superificial layer that is the thinnest, contains 5 layers when it is thick skin
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what are the 5 layers of the epidermis?
stratum corneum, stratum lucidium, stratum granulosum, stratum spnosum, stratum basale
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what cells are in the epidermis?
KERATINOCYTES: 90%, produces keratin to protect skin and waterproof, MELANOCYTES: 8%, produces melanin that gives skin colour, intraepidermal macrophage for immune response and tactile epithelial cells for touch
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What is the dermis?
thickest layer, connective tissue, vascular, mainly live cells
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what are the different layers of the dermis?
SUPERIFICAL PAPILLARY REGION: 1/5, contains connective tissue, fine elastic fibers, capillary loops and meissner corpuscles DEEPER RETICULAR REGION: 4/5, contains collagen & elastic fibers, sweat & sebaceous glands, hair follicles, nerves & adipose
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what is the subcutaneous layer?
areolar and adipose tissue, contains pacinian corpuscles (sensitive to pressure)
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what are the accessory structures of the skin?
hair, nails and skin glands
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Hair
present on most skin surfaces, genetic & hormonal influences, main functions are protection, sweat, etc, normal loss is 75-100 a day
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stages of hair growth
anagen, catagen, telogen
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Nails
made of tightly packed dead kertainised epidermal cells,nail bed is visble but nail root is hidden, growth rate about 1mm a week, functions: protection, grasp & scratch
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Skin glands
SEBACEOUS GLANDS: produce sebum to prevent dry, SWEAT GLANDS: involved in emotional sweating, eccrine - regulate body temp and apocrine - dont regulate temp
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functions of the skin
thermoregulation, blood reservoir, protection, sensations, excretion/absorption and Vit D synthesis
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what does keratin do?
protects underlying tissues from infections, chemicals & heat
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what do lipids do?
inhibit evaporation of water
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what does sebum do?
keeps hair from drying
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what does acid do?
ph sweat stops bacterial growth
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what does melanin do?
protects from UV damage
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what do macrophages do?
phagocyts and activate immune system
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Vitamin D
synthesised in skin in response to UV and diet, transported to liver
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Other cards in this set

Card 2

Front

true

Back

true or false, the skin is the the largest organ but 2nd heaviest

Card 3

Front

epidermis, dermis and subcutaneous

Back

Preview of the back of card 3

Card 4

Front

the superificial layer that is the thinnest, contains 5 layers when it is thick skin

Back

Preview of the back of card 4

Card 5

Front

stratum corneum, stratum lucidium, stratum granulosum, stratum spnosum, stratum basale

Back

Preview of the back of card 5
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