00:00Why does the sun cause sunburns?
00:03Nothing spoils a day outdoors faster than sunburn.
00:07But what's actually going on with your skin when it goes from tan to burn?
00:12Or for some people, straight to burn?
00:15Everyone's skin contains a pigment called melanin.
00:18The more melanin a person has, the darker their skin.
00:21Now melanin plays an important role when it comes to protecting your skin from the sun.
00:25The pigment absorbs UV radiation, protecting your skin from its damaging effects.
00:31In fact, the reason a person tans in the first place is actually a defense mechanism.
00:36When UV rays hit your skin, your body starts to make more melanin because the more melanin
00:42you have, the better protected you are.
00:44And the more melanin your skin produces, the darker your tan.
00:48Now, you may be thinking, if the body has this great natural defense, why do we still
00:52get burned?
00:53Well, each person can only produce so much melanin.
00:57An amount that's determined by your genetics.
00:59Simply put, most people aren't able to make enough to adequately protect their skin.
01:05And when the melanin runs out, the burns begin.
01:08Damage from the sun essentially causes skin cells to die off.
01:12And when this happens, the body sends blood to the area to help the healing process, giving
01:17your skin that bright red color.
01:19It also sends immune molecules that lead to pain and inflammation.
01:23So, think of melanin as your first line of defense, but it shouldn't be your only line
01:28of defense.
01:29That's where sunscreen comes in.
01:30Why sun burns the skin, just another one of life's little mysteries.
01:35My first use Punktions to protect your skin.
01:35My bad красくてを 오늘に対してはízのionsと一緒に変わらないい
01:35серь先の全体にこのような研究はVir 게炎を写す、「水源多めの中心者通人がマリアド被宮臣をお過ごすんのエピストアの災のあなたについて最も明らかに断望るために脅往大量!
01:35Ant巨になった病気なので、マリアドが変わらない者だったohl niños。 norm利akan,全alts通知界王と措った千切れがある
Comments