https://padlet.com/thamiettouati/ccm2f0jn34e7 Made with magic en-us 2016-09-08 14:54:37 UTC 2023-06-21 05:53:01 UTC hello@padlet.com diegomillar https://padlet.com/thamiettouati/ccm2f0jn34e7/wish/122465720 Stratum Corneum: 20-30 layers of cornified, dead skin cells called corneocytes

Stratum Lucidum: Looks translucent due to dead keratinocytes and is only found in areas with thick skin, namely the soles of the feet and palms of the hands

Stratum Granulosum: Features cells that have what look like granules, this is where keratinization also occurs

Stratum Spinosum: Largest section of the epidermis and is the location of keratinocytes which allows the skin to be flexible

Stratum Basale: The deepest layer where the newest cells are formed through mitosis

Source: https://www.boundless.com/physiology/textbooks/boundless-anatomy-and-physiology-textbook/integumentary-system-5/the-skin-64/structure-of-the-skin-epidermis-394-7794/]]> 2016-09-08 15:06:02 UTC https://padlet.com/thamiettouati/ccm2f0jn34e7/wish/122465720 tatiyana_hall08 https://padlet.com/thamiettouati/ccm2f0jn34e7/wish/122465933 The melanocytes are located in the Stratum Basale. The Stratum Basale is Actively mitotic stem cells; as cells age they become part of superficial layers.
Melanin is only skin pigment out of three made in the skin. Melanocytes synthesize melanin.
Melanocytes in black and brown skin people produce more and darker melanosomes.
V.Podkomorski Notes
9/8/16
http://www.shutterstock.com/pic-174446576/stock-vector-melanocyte-and-melanin-layers-of-epidermis-melanocytes-produce-the-pigment-melanin-which-they.html]]> 2016-09-08 15:06:22 UTC https://padlet.com/thamiettouati/ccm2f0jn34e7/wish/122465933 schulze1014 https://padlet.com/thamiettouati/ccm2f0jn34e7/wish/122465938 The body benefits from vitamin D by regulating the amount of calcium and phosphorus absorption, maintenance of healthy bones and teeth, and is suggested to protect against diseases such as cancer and diabetes. If a person is vitamin D deficient, their bone tissue will not form properly, causing them to have weak bones and skeletal deformities.
medicalnewstoday.com]]> 2016-09-08 15:06:23 UTC https://padlet.com/thamiettouati/ccm2f0jn34e7/wish/122465938 thamiettouati https://padlet.com/thamiettouati/ccm2f0jn34e7/wish/122466364 Nature selects for less melanin when ultraviolet radiation is weak.  In such an environment, very dark skin is a disadvantage because it can prevent people from producing enough vitamin D, potentially resulting in rickets disease in children and osteoporosis in adults. ]]> 2016-09-08 15:07:04 UTC https://padlet.com/thamiettouati/ccm2f0jn34e7/wish/122466364 thamiettouati https://padlet.com/thamiettouati/ccm2f0jn34e7/wish/122600209 2016-09-08 21:01:46 UTC https://padlet.com/thamiettouati/ccm2f0jn34e7/wish/122600209 thamiettouati https://padlet.com/thamiettouati/ccm2f0jn34e7/wish/122600522 Yes there is a correlation with Vitamin D deficiency and amount of melanin in skin. Because people that migrated away from the equator into areas less exposed to the sun, there was not enough UV radiation to produce sufficient vitamin D to prevent diseases such as rickets. Their bodies compensated by producing less melanin, so that more sunlight would be allowed to go through.
http://www.webexhibits.org/causesofcolor/7F.html]]> 2016-09-08 21:03:30 UTC https://padlet.com/thamiettouati/ccm2f0jn34e7/wish/122600522 schulze1014 https://padlet.com/thamiettouati/ccm2f0jn34e7/wish/122602059 UVA radiation causes damage to melanocytes, however, researchers say that UV radiation can generate reactive oxygen and nitrogen that energizes an electron in melanin. This energy can cause lesions in the DNA, creating cancer-causing mutations. 
healthline.com]]> 2016-09-08 21:13:26 UTC https://padlet.com/thamiettouati/ccm2f0jn34e7/wish/122602059 mendozavalessa https://padlet.com/thamiettouati/ccm2f0jn34e7/wish/122610376 Cells in the skin convert into Vitamin D when UV light hits the body. From there, the vitamin flows through the bloodstream and into the liver and kidneys where it turns into active D also known as Calcitriol. 
edpuzzle.com]]> 2016-09-08 22:26:27 UTC https://padlet.com/thamiettouati/ccm2f0jn34e7/wish/122610376