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6 Vital Functions of Integumentary System
- 1. Protection from pathogens
- 2. Keeps the body from drying out
- 3. Stores fatty tissue for energy
- 4. Produces VD
- 5. Sensory input
- 6. Regulates body temperature
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Three Layers of the Skin:
- Epidermis
- Dermis (corium)
- Subcutaneous Fascia (hypodermis)
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Facts about the Epidermis:
5 Layers: Stratum corneum, lucidum, granulosum, spinosum, basale
*Cells start in basale layer and push up to corneum layer and shed
* Cells are flat, scaly, keratinizied stratified squamous epithelial cells
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Facts about the Dermis:
- * Below the epidermis
- * Thicker than epidermis
- * Dense, irregular connective tissue
- * Contains:
- - Capillaries
- - Collagenous and elastic fibers
- - Involuntary muscles
- - Nerve Endings
- - Lymph vessels
- - Hair follicles
- - Sudoriferous (sweat) glands
- - Sebaceous (oil) glands
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Subcutaneous Fascia (third skin layer)
*Hypodermis*
- * Deepest layer of skin
- * Elastic/fibrous connective & fatty tissue
- * contains lypocytes (fat cells)
- * Attached to muscle
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3 Burn Complications:
- * Bacterial Infections
- * Fluid Loss
- * Heat Loss
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Nails:
- * Specialized Epithelial Cells
- * Nail Bed part of Epidermis
- * Become keratinized (cells dry, shrink, push to surface, filled with protein keratin)
- * Lunula (white half moon) thick cells
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Peripheral Perfusion (blood flow):
- * Pink color of nail aids in assessment of blood flow to the extremities
- * Test by capillary refill time
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Hair:
- * Composed of Keratin (like nails)
- * Regulates body temperature
- * Functions as sensor to detect things (bugs)
- * Eyelashes protect eyes
- * Nose hair filters particulate matter
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Temperature Regulation:
When your temperature RISES, your body signals the blood vessels in the skin to get...
Larger - Vasodilation
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Temperature Regulation:
When cold and the body needs to warm up, the peripheral blood vessels will become....
Smaller- Vasoconstrict
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One layer of cells:
simple
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two or more layers of cells:
stratified
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Squamos:
thin, flattened cells
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cuboidal:
cube like shaped cells
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columnar:
elongated cells
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Epithelial Cells:
Tightly packed cells that form an effective barrier
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What is collagen?
- - Most abundant protein in the body
- - makes up connective tissue & extracellular matrix
- - Very strong, made of bundles of fibers
- - supports skin and body, prevents tissues from stretching
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What is elastin?
- - protein found in extracellular matrix
- - provides skin and organs with elasticity
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