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14 Cards in this Set

  • Front
  • Back
What are the 4 structures of the skin?
epidermal appendages
epidermis -
top layer of skin; layers of epithelial cells; dead cells -4layers; renews itself every 30 days.
What are the 2 types of cells found in the epidermis?
melanocytes - 5% -pigment; protects from uv light.
keratinocytes - 95% - waterproofing; protects against invasion.
Dermis -
supportive tissue; very vascular; helps control body temp.; can alter BP. ex. body hot, vessels dilate, BP decreases.
hypodermis -
provides insulation; connects dermis to what's underneath.
epidermal appendages -
all things that pass through dermis - hair follicles, glands, etc.
Function of skin -
keeps what's inside from coming out (loss of fluid); temp regulation; synthesis of vitamin D; fluids and wastes excreted thru skin (600 ml per day)> insensible loss.
Urea, ammonia, sodium excreted through skin. Sensory info from outside environment. As age, lose elasticity, lose insulation, tears more easily, decreased blood flow - heals slower; gland activity decreases, skin gets drier.
What are the 4 types of burn injuries?
thermal -
most common - 90% of burns
contact with hot material
damage from coagulation of protein in whatever tissue is involved. Extent of thermal injury > time and temperature.
140 degrees - 3-5 seconds=burn
112 degrees - won't cause burn
water heater at home > 120 deg
chemical -
contact with tissue destructing substance: acid or alkyline. Can be dry or liquid chemicals (when inhaled, dry)does same thing in respiratory tract that can't wash out.> can take up to 3 days to get out.
which is more severe, acid or alkyline chemical?
alkyline - diffuse into cell more quickly, takes longer to neutralize.
electical -
produces tissue coagulation and disrupts nerve impulses that go through area. Entry and exit point (usually bigger) everything in between is coagulated.
smoke and inhalation -
smoke damage from chemicals in fire. Damage above glottis due to heat. Glottis closes when heat contacts, don't get damage below. Below glottis, inhalation damage from toxins.
carbon monoxide -
majority of deaths at scene - CO has greater infinity for hemoglobin, displaces oxygen -die of anoxia.