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Topic 17: The Integumentary System

- peel amongst elbow grease in addition to stone oil glands, pilus in addition to nails
- covers the outer surface of the body, likewise equally inner membranes of eyelids, nostrils in addition to other torso openings

Structure in addition to function:

1. Epidermis - outer layer of skin
- formed of stratified (layered) squamous epithelium
- thicker inwards areas plain of report to friction (palms, soles)
- 25-30 layers, flattened dead cells that are filled amongst keratin (makes the epidermis rough, leathery in addition to waterproof)
- cells are produced inwards the germinative layer, in addition to hence pushed to the surface in addition to shed.  This procedure takes nearly 45 days

Source: http://www.womens-health-advice.com/skin-structure-function.html
- role equally a barrier against dehydration in addition to a showtime trouble of defense forcefulness against toxins in addition to microbes

- the epidermis contains melanocytes - cells which create melanin (brown-black pigment), which protects cells from solar radiations damage.  Melanin production varies amongst exposure to sunlight in addition to heredity

Source:  http://en.wikipedia.org/wiki/Melanocyte
- no blood vessels are flora inwards the epidermis, all food in addition to gas telephone commutation occurs past times diffusion in addition to active carry from capilaries inwards the dermis.
Source:  http://www.tcmimassager.com/CellulessMassager.html
Vital functions of skin
1.  Protection - mechanical (abrasion,injury), physical (water loss, UV radiation), chemic (toxins), microbial (bacteria, viruses)
2.  Sensory - provides a broad make of data nearly the environment
3.  Thermoregulation - capillaries, sweat

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