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This 4 page Class Notes was uploaded by Melanie Queener on Monday August 31, 2015. The Class Notes belongs to Bio 3310 at Bowling Green State University taught by Dr. Ray Larsen in Fall 2015. Since its upload, it has received 46 views. For similar materials see Anatomy and Physiology I in Biology at Bowling Green State University.
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Date Created: 08/31/15
Burns Leading cause of accidental death Fires kitchen spills sunlight ionizing radiation strong acidsbases electrical shock Death results from uid loss infection and toxic effects Eschar burned dead tissue Debridement removal of dead tissue Degree of Burn 0 1St Degree Partial thickness 0 Least severe 0 Ex Sunburn 0 Effects epidermal layer 0 2nd Degree Partial Thickness o More severe 0 Effects both epidermal and dermis layers 0 More painful 0 Will heal on its own 0 3rd Degree Full thickness 0 Effects all of epidermal and dermis and into the tissue below 0 Not as painful due to dead nerve cells 0 Can t heal itself skin graphs are used Skin Graphs 0 Autograft tissue taken from another part of the body 0 Splitskin graft taking epidermis and part of the dermis from an undamaged area such as thigh or buttocks o Isograft skin from an identical twin Temporary Grafts immune system rejection 0 Homograft allograft unrelated persom o Heterograft xenograft another species 0 Amnion from afterbirth Exposure to UV Light 0 Longer wavelength UVA o Penetrates deeper trigger melanocytes 0 Shorter wavelength UVB 0 Less penetration more energydamaging o Kills keratinocytes in ammation I Itching peeling nausea fever 0 Both can cause photosensitivity 0 Both can cause skin cancer Blocks and Screens 0 Sunscreens block UVB o Benzophenone 0 Protection against burn 0 Sunblocks blocks UVA and UVB o Zinc oxide 0 Protection against skin cancer 0 Sun protection factor SPF o SPF 10 90 UVB protection 0 SPF 20 95 UVB protection Skin Cancer 0 Induced by UV rays 0 Most likely occurs on head and neck 0 Primarily effect fair skinned and elderly 0 Most common cancer in the USA 0 One of the easiest to treat 0 Three types 0 Basal cell carcinoma Squamous cell carcinoma Malignant Melanoma least common 0 Basal Cell Carcinoma I Most common and least dangerous rarely metastasizes I Forms from cells instratum basale I Small tiny bump With central depression and beaded edges 0 Squamous Cell Carcinoma I Arise from keratinocytes from stratum spinosum I Appear on scalp ears lower lip back of hand I Raised reddened scaly appearance later forming a concave ulcer I Chance of recovery is good if detected early 0 May metastasize to lymph nodes if left untreated o Malignant Melanoma I Skin cancer arising from melanocytes commonly in a preexisting mole I Less than 5 of skin cancers I Metastasizes rapidly unresponsive to chemotherapy high fatality I Average survival rate is 6 months I Greatest risk factor is familial history I High incidence in men red heads those Who experience high sunburns during childhood Other Structures in the Skin 0 Hairfeather scales 0 Form from epidermis o NailsClawshooves Teeth Hair Pili 0 Protection 0 Reduction of heat loss 0 Sensing light touch 0 Composed of o Shaft extends beyond skin 0 Root penetrates into dermis 0 Grows from o Follicle epithelial root sheath surrounding three layers of hair root 0 Matrix I Deprived from stratum basale I Contains melanocytes o Papilla I Areolar CT 0 Capillary Bed 0 Distribution 0 Everywhere except I Palms and soles I Ventral and lateral surface of fingers and toes I Certain genital areas 0 Limbs and trunk have 5570 hair follicles per squared cm I Face has about 10 times as many I Hair distribution does not differ much from person to person 0 Even between sexes 0 Differences in appearances due to texture and pigmentation of the hair 0 Hair shows exposure to chemicals over a long period 0 Used in drug testing 0 Types of Hair 0 Lanugo first born 0 Velius peach fuzz I Arm hair etc 0 Terminal eye lashes eye brows on head 0 Cycle 0 Anagen 68 years 0 Catagen degenerative 23 weeks 0 Telogen resting phase 0 Growth and Loss I Depends on genetics and nutrition I Alopecia balding or thinning of hair Pattern Baldness losing hair in specific places 0 Genetic and hormonal in uences I Hirsutism excessive or undesirable hairiness Nails 0 Grow slower than hair 1 inmonth 0 Grows at and from the matrix
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