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5 Cards in this Set
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Skin functions protects - from book Pg 112 and table 4.1 on pg 113 (integumentary system functions) |
-mechanical damage- physical barrier contains keratin, which toughens cells; fat cells to cushion blows; and pressure receptors, which alert the nervous system -chemical damage(acids and bases)- has relatively impermeable keratinized cells; contains pain receptors which alert the nervous system. -bacterial damage- has an unbroken surface and "acid mantle"...skin secreation is acidic and thus inhibit bacteria. Phagocytes ingest foreign substances -ultraviolet radiation- melanin produced by melancytes offers protection from UV damage. -Thermal damage- contains heat/cold/pain receptors -desiccation- drying out- cpmtaoms a water resisting glycolipid and keratin Aids in body heat or loss Aids in excretion of urea and uric acid- contained in sweat glands and perspired Synthesizes vitamin D - modified cholesterol molecules in skin converted to vitamin D by sunlight |
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Skin Functions - from class notes |
1. Protects- mechanical and chemical barriers between the body and environment
2. waterproof- dehydration protection 3. Temperature regulation - cooling and heating mechanisms, major job.... -blood vessels dilate to release sweat, as sweat evaporates, body heat is dissipated and thus cools the body preventing overheating. -blood vessels constrict when it is cold reducing blood flow to skins surface. 4. Vitamin synthesis- Vitamin D 5. Sense "organ" 6. Excretory "organ" ...sweat 7. Storage - fat, water, glucose, NaC1 etc -Skin is self lubricating - it becomes sebaceous glands - High potential for healing -Skin surface has microflora |
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Body membranes |
-cover surfaces -line body cavities -form protective and often lubricating sheets around organs |
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Body membranes fall into two major groups |
1. epithelial membranes, which include the cutaneous, mucous, and serous membranes 2. connective tissue membranes, represented by synovial membranes |
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cutaneous membrane is generally called... |
the skin or integumentary system |
