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http://www.headandneckcancerguide.org/adults/introduction-to-head-and-neck-cancer/skin-cancer/anatomy/

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http://oerpub.github.io/epubjs-demo-book/content/m46060.xhtml

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How is vitamin D synthesized in the body? (use edpuzzle video)

A: Vitamin D is needed for bones to keep producing new bones and is the only vitamin the body produces on its own. The skin cells contain a molecule that converts to vitamin D when coming into contact with UV light, and vitamin D goes through the bloodstream to the lungs, liver and kidneys and becomes truly activated into calcitriol and circulated to all the bones of the body.

Source: edpuzzle

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How does melanin function differ between people closest to the equator vs furthest from the equator? Add picture and sources.

A: Melanin is the skin pigment that gives people either dark skin or light skin. People closer to the equator typically have darker skin than people farther from it, because melanin is a source of protection against UV light that are essential people close to the equator.

Source: http://www.medicinenet.com/script/main/art.asp?articlekey=4340

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Is there a correlation with skin cancer and the amount of melanin in the skin?

A: No melanin mo problems.
Source: Fischer, Kristen. "Study: Melanin Protects Us from Skin Cancer but Can Also Cause It." Healthlines RSS News. Healthline, 19 Feb. 2015. Web. 08 Sept. 2016.

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Is there a correlation with vitamin D deficiency and amount of melanin in skin?

A: The less melanin a person has, the higher the chances are of Vitamin D deficiency. People living in regions where UV rays are more harsh have more melanin to protect themselves from the rays. With more melanin less Vitamin D is absorbed causing them to have a deficiency.

Source:
https://www.nasw.org/article/vitamin-d-levels-determined-how-human-skin-color-evolved

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What are the benefits of Vitamin D? What happens if you are vitamin D deficient?

A: The benefits of Vitamin D include protection against certain diseases, the preservation of healthy bones plus teeth, and regulation of insulin levels. If a person was Vitamin D deficient they could possibly get cancer, have brittle bones, or be toothless.

Source:
http://www.medicalnewstoday.com/articles/161618.php

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Location of melanocytes and the overall function. Add picture and sources.

A: Melanocytes synthesize melanin, found in stratum basale. The color will end up showing in the pigment of the skin, which is why humans have different skin colors.
The kind of melanosome colors shown for a person depends on how much light they receive from the sun.

(Podkomorski, 2016)

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Write out the layers of the epidermis from superficial to deep. Give a brief description of each layer. Add picture and site source.

A: Stratum corneum- 20-30 dead, horny layers
Stratum Lucidum- Only in thicker layers of skin
Stratum Granulosum-  Keratinocytes migrating from the underlying stratum spinosum become known as granular cells in this layer
Stratum Spinosum- Most layers; location of keratinocyte
Stratum Basale- Actively mitotic stem cells; as cells age they become part of superficial layers

(Podkomorski, 2016)