immune system cells, first line of defense B. Body temperature regulation 1. Sweat glands 2. Constriction of dermal capillaries – can constrict or enlarge vessels to regulate amount of blood flow C. Cutaneous sensation D. Metabolism: produces vitamin D from blood-borne precursors – from sunlight, we don’t synthesize enough of it without UV light, vitamin D is important to take up calcium, without vitamin D, calcium cannot be absorbed
E. Blood reservoir: holds up to 5% of the body’s blood supply F. Excretion: nitrogenous wastes – taking something from blood to outside, byproducts of metabolism, mostly accomplished by kidneys, but also a little by sweat (ammonia) IV. Homeostatic Imbalances of Skin A. Skin Cancer – carcinoma are cancer of epithelial 1. Basal cell carcinoma: least malignant and the most common skin cancer – stratum basale layer 2. Squamous cell carcinoma: grows rapidly and metastasize if not removed – stratum spinosum 3. Melanoma: most dangerous of skin cancers; highly metastatic and resistant to chemotherapy – too much UV light (melanocytes) leave original position and travels throughout the body (metastasis) B. Burns –surnburns are 1 st degree burns usually, 3 rd degree burns affect the dermal layer 1. Tissue damage inflicted by intense heat, electricity, radiation, or certain chemicals 2. The most immediate threat to a burn patient is dehydration and electrolyte imbalance 3. After the first 24 hours has passed, the threat to a burn patient becomes infection to the wound site 4. Burns are classified according to their severity a. First-degree burns involve damage only to the epidermis b. Second-degree burns injure the epidermis and the upper region of the dermis c. Third-degree burns involve the entire thickness of the skin
You've reached the end of your free preview.
Want to read all 5 pages?
- Fall '07
- stratum basale, stratum spinosum, APOCRINE SWEAT GLANDS, Eccrine sweat glands