# data[].attributes.body
sunlight plays an important role in supplying one of your bodies most necessary materials: vitamin D.  Once your skin cells detect sunlight and convert it to vitamin D, the vitamin heads to the bloodstream to the liver and kidneys where the vitamin can finally become active.

https://www.youtube.com/watch?v=EN-x-zXXVwQ

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There is a correlation with vitamin D deficiency and the amount of melanin in skin. People with a high amount of melanin are more at risk for being diagnosed with vitamin D deficicency. This is beacuse the high melanin levels block out most of the sunlight, which is a main source of vitamin D. Whereas people with lower levels of melanin have less of a chance of having viatmin D deficiency. This is because the low amounts of melanin allows for more vitamin D to be absorbed from the sun which leads to less time needed to acquire enough viatmin D from sunlight.

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3356951/

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The Bennefits of Vitamin D
~Lowers the chance of heart attacks,multiple sclerosis, and rheumatoid arthitis.
~Reduces the risk of diabetes
~Stimulates your pancreas to make insulin & regulates your immune system
~Essential to regulation of calcium and phosphorus absorbtion which maintains healthy bones and teeth.

Vitamin D Deficinecy
~Tiredness, general aches & pains
~Weakness in bones, which can lead to osteoporosis or osteomalacia in older years.
~Increased risks of type 1 diabetes
~Increased risks of cancers  of the colon, prostate, breast, ovaries, esophagus, and lymphatic system.

http://www.webmd.com/food-recipes/features/vitamin-d-vital-role-in-your-health#1
http://www.vitamindcouncil.org/about-vitamin-d/am-i-deficient-in-vitamin-d/?gclid=CNGD-7CMgc8CFYg6gQodVBkEZw

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The melanocytes are located in the Stratum Basale. The melanocytes synthesize melanin.
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Picture:
http://www.dermweb.com/hairnailsmucousmembranes/figure1-7page.htm

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There is a correlation between the amount of melanin in the skin and cancer. If there is not enough melanin in the skin, the skin will not provide as much protection from the sun as it would for someone with a darker complexion/more melanin. Due to this, cancer may occur more in those with less melanin in their skin.

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People that live closest to the equator have much more melanin than those near the poles. Closer to the equator, a higher concentration of melanin is advantageous because it will provide protection against the sun's harmful rays. Further from the equator, it is more beneficial to have a less concentration of melanin because their isn't as much sunlight readily available to those near the poles in order to supply vitamin D.

https://www.youtube.com/watch?v=EN-x-zXXVwQ

http://anthro.palomar.edu/adapt/adapt_4.htm

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The layers of the epidermis from superficial to deep are:
-1: stratum corneum
-2: stratum lucidum
-3: stratum granulosum
-4: stratum spinousum
-5: stratum basale

Stratum Corneum: they are known as the "horny layers". They are 20-30 dead.

Stratum Lucidum: This layer is only found in the thicker skins. It can be found in the heels of the feet and the palms of the hand.

Stratum Granulosum: This layer contains granules.

Stratum Spinosum: This layer contains the most layers. In the Stratum Spinosum, keratinocyte will be found.

Stratum Basale: This layer contains actively mitotic stem cells. Overtime, as the cells age, they become a part of superficial layers.
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Picture of all layers
http://slideplayer.com/slide/3451324/
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Pictures (In order from Deep to Superficial)

Stratum Basale:
https://quizlet.com/7004042/integument-flash-cards/

Stratum Spinosum:
http://www.meddean.luc.edu/lumen/meded/medicine/dermatology/melton/skinlsn/stspin.htm

Stratum Granulosum:
http://www.meddean.luc.edu/lumen/meded/medicine/dermatology/melton/skinlsn/stgran.htm

Stratum Lucidum:
http://slideplayer.com/slide/6424287/

Stratum Corneum:
http://cerave.ca/images/stories/product/your_skin2.jpg