NR 283 Exam Review 2 SKIN CH8

NR 283 Exam Review 2 SKIN CH8Layers of skin: *varies in layer of thickness • Epidermis a. Avascular/no nerves b. Consists of 5 layers c. Hair follicles d. glands • Dermis a. Elastic fibers b. Collagen fibers c. Flexibility & strength of the skin d. Contains nerves & blood vessels • Subcutaneous tissue (hypodermis) a. Connective tissue b. Fat cells c. Blood vessels d. Nerves e. Macrophages f. fibroblasts Keratin: waterproofing of the skin Melanin: skin pigment- determines color of skin Albinisim: lack melatonin production • lacks pigmentation in iris • White hair • White skin – susceptible to skin cancer • Autosomal rec Vitiligo: small areas of hypopigmentation Melasma: overproduction of melanin • Patches of darker skin Dermis… Sensory receptors: • Pressure • Touch • Pain • Heat