Chapter5_angel - KIN 216 Applied Human Anatomy Chapter 5...

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Unformatted text preview: KIN 216 Applied Human Anatomy Chapter 5 Slides adapted from Dr Pfeiffer Integumentary System • Integumentary system = skin plus hair, glands, and nails • Integument = skin – Largest organ in the body- is considered an organ because it consists of several kinds of tissues that are structurally arranged to function together – Represents ~7% of body weight (>3000 square inches) – Variable thickness (1.5 – 4 mm) – 2 regions: dermis, epidermis • Derm = skin (Greek), cutis = skin (Latin) • Dermatitis = inflammation of the skin • Dermabrasion = process to remove tattoo • Dermatome = instrument to cut skin Functions of Integumentary System • Protection – Protects against water (keratin) – Microorganisms (oil glands) – UV light damage (melanin) – Cushions and insulates deeper organs • Homeostasis – “Same state” – Helps regulate temperature – Helps prevent water loss PETER GARDINER/SCIENCE PHOTO LIBRARY Functions of the Integumentary System • Sensory receptors – Touch, pain, temperature, pressure • Nonverbal communication – Rash, flushed skin • Others – Cutaneous absorption • Ex: lipids can cross easily (so many toxins and pesticides can cross) • “The patch” – Synthesis of vitamin D, which is needed to absorb calcium http://www.ehow.com/how_7344116_eliminate-red-cheeks.html Epidermis • Thin protective outer covering • Stratified epithelium (varies in thickness . 007-.12mm) • All layers are dead cells except bottom few (deepest) • It takes 6-8 weeks for bottom layers to reach top, then get sloughed off (millions of them) Epidermis • When cells are alive in bottom layer they secrete keratin (toughens and waterproofs the skin) • Increased keratin responsible for cornification of the skin (calluses, corns) • Relatively avascular, fairly thin relative to the dermis • 5 layers (strata) in thick skin; 4 layers in thin skin Epidermal Layers • Stratum basale – Deepest layer – Single row of cells, mostly stem cells – Rapid division – Merkel cell (tactile epithelial cell): associated with touch (sensory nerve ending) • Blue cell with yellow sensory n....
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This note was uploaded on 10/17/2011 for the course KINESIOLOG 216 taught by Professor Vollner during the Spring '11 term at Michigan State University.

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Chapter5_angel - KIN 216 Applied Human Anatomy Chapter 5...

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