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Skin Cancer - fewer blood vessels and those remaining are...

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Skin Cancer caused by excessive or chronic exposure to UV, xrays or radiation most forms progress slowly and are easily treated a few are deadly 1. Basal Cell Carcinoma least malignant most common stratum basale cant form keratin lose boundary layer between epidermis and dermis results in tissue erosion and ulceration 99% of these cancers are fully cured 2. Squamous Cell Carcinoma cancer of the cells in stratum spinosum usually induced by sun cells grow rapidly and grow into the lymphatic tissues 3. Malignant Melanoma cancer of pigment cells = melanocytes rare ~1% of skin cancers deadly, poor chance of cure once it develops often begins with moles F. Aging Skin effects often become noticeable by late 40’s Hair thinner and grayer as melanocytes die and mitosis slows Oil glands sebaceous glands atrophy skin and hair become drier Skin Layers mitosis declines, collagen is lost from dermis skin becomes thinner and translucent
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looser and sagging as elastic fibers are lost and dermal papillae smooth out
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Unformatted text preview: fewer blood vessels and those remaining are more fragile more bruising, slower healing and rosacea ‡ tiny dilated blod vessels esp in nose and cheeks age spots – accumulation of pigment cells loss of immune cells and fibroblasts makes skin more susceptible Human Anatomy & Physiology: Integumentary System, Lecture Notes, Ziser, 2005 10 to recurring infections thermoregulation is less efficient due to loss of blood vessels and glands ‡ more vulnerable to hypothermia and heatstroke photoaging = an acceleration of skin aging due to overexposure to sun (UV) accounts for 90% of the changes that people find medically troubling or cosmetically disagreeable G. Autoimmune Disease eg. alopecia areata causes hair to fall out in small round patches ~2% of population (4.7M in US) have some form of it hair loss is usually short term and limited to a few patches in rare cases causes permanent loss of all body hair...
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