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1-Epidermis- thin outer layer of skin.
Cells are dead- continuously rubbed off by clothing, washing etc.
You produce a whole new layer of skin every 28 days.
Epidermis also produces the non living part of skin- hair and nails
Below the dermis is the Subcutaneous Layer.This layer binds the skin to the body. This is
where fat is stored
1-Protection- 1st line of defense against disease. Holds moisture inside your body so tissue and
organs do not dry out.Produces Melanin-pigment in the epidermis
that gives skin color. Keeps out harmful UV rays in sunlight.
2-SensationReceptor- Nerve ending that receives
information from the environment and sends it to the brain. Receptors in skin sense cold, heat, contact, and pressure.
3-Temperature Regulation Body must stay between 97-98 degrees F. Sweat glands and blood vessels in the dermis
work together to maintain a normal temperature.
Sweat glands produce perspiration to cool the skin
Blood vessels in the skin dilate- this allows more blood to go to the surface to release the heat.
4- Waste RemovalOur body takes in food, water, and air. The
body uses these materials in building new cells.
These produce waste products- they include salts, urea, and extra water- all are released through perspiration.
Sebaceous glands- structures within the skin that produce an oily secretion called sebum.
found in the dermis
Calculate Your Recommended SPF , or Sun Protection Factor, increases the length of time you can stay outside in the sun without incurring sunburn or irritation from UV-B rays. At present there is no standard to measure protection from UV-A rays.
Rate yourself:Select your skin type. The corresponding amount of time indicates how long you can stay safely in the sun before burning.Fair skin - 10 minutes Olive skin - 15 minutes Dark skin - 20 minutes
Look at the SPF on your sunscreenNote which SPF is stated on the product labeling, EXAMPLE- SPF 20
Calculate your protection time, the amount of time you can stay outside before burning:Multiply the sun safety time for your skin type with the SPF listed on your sunscreen.eg. 15 minutes (for olive skin) x SPF 20 = 300 minutes (5 hours) of sun protectionResult: Olive skin using a sunscreen with SPF 20 can under ideal conditions stay in the sun for up to 5 hours.