1. Integument

2. Functions 1. Protects against infection 2.Protects against water loss 3.Sensory: touch, pressure, pain temperature Homeostasis

3. Layers 1.Epidermis-outer layer, stratified squamous a) Stratum Corneum: outer layer of dead cells, contain keratin, water proofing e) Stratum Germinativum: bottom layer of epidermis-mitosis happens * Melanocytes: contain melanin pigment, protection from UV.

4. 2.Dermis: under epidermis- loose connective tissue, contains elastin g) Nerve h/i) Artery/Vein (blood supply) * hair: heat protection k) shaft-dead epidermal cells l) Follicle: “bulb” of hair, alive o) Arrector pili muscle-attaches to hair

5. P) Sebaceous gland: produces sebum (oil) lubricates skin, stops bacteria (acne) q) Sweat gland: regulates body temperature 3. Subcutaneous Layer (r): part of dermis, adipose tissue for insulation

7. Burn review

8. Burns: Tissue damage due to heat, cold, chemicals, UV, electricity 1 st degree: sunburn, redness (epidermis)

10. 2 nd degree: blistering, pain (dermis)

11. 3 rd degree: burned through the epidermis and dermis, pain from surrounding tissue. Skin graft needed- infection/water loss

12. 1str degree 2 nd degree 3 rd degree

13. Skin Cancer Uncontrolled growth in stratum germinativum, can be caused by UV light

16. Types 1.Basal cell cancer (stratum germinativum) 90% of cases, least deadly 2.Squamous cell (below germinativum) 5% of cases 3.Malignant Melanoma (affects melanocytes) 5% of cases, most deadly, spreads, new moles-changing size/shape

17. Malignant Melanoma Basal Cell Basal CellSquamous Cell