WEBVTT

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CARTAN-HANSEN: SKIN COVERS YOU

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FROM HEAD TO TOE, LIKE A COAT

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OF ARMOR; IT SHIELDS YOUR

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BONES AND PROTECTS YOUR

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INTERNAL ORGANS FROM BEING

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HURT.

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THE OUTSIDE LAYER OF SKIN IS

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KNOWN AS THE EPIDERMIS; IT'S

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REMARKABLY ELASTIC AND IN MOST

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PLACES, COVERED WITH A FINE

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COAT OF HAIR.

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IT'S A TOUGH LATER THAT'S

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WATERPROOF AND SEALS OUT

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INVADING GERMS.

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BUT IT WEARS AWAY, SHEDDING

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MILLIONS OF DEAD SKIN FLAKES

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EVERY MINUTE.

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BUT UNDERNEATH NEW CELLS

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CONSTANTLY REPLACE THE OLD.

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THE LAYER BENEATH THAT IS THE

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DERMIS, WHICH IS PACKED WITH

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BLOOD VEINS, BRINGING

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NUTRIENTS; A NETWORK OF

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FIBERS, WHICH HOLD US

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TOGETHER, SWEAT GLANDS, HAIR

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FOLLICLES, AND SENSITIVE NERVE

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ENDINGS.

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YOUR SKIN PLAYS AN IMPORTANT

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PART IN KEEPING YOU JUST THE

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RIGHT TEMPERATURE - WHEN YOU

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GET TOO HOT, SWEAT OOZES UP

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AND OUT TINY PORES CALLED

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SWEAT PORES ONTO YOUR SKIN.

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EVEN YOUR FINGERTIP HAS DOZENS

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OF SWEAT GLANDS JUST BELOW THE

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SURFACE.

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AND SWEAT COOLS YOUR BODY BY

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EVAPORATION.

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AND WHEN YOU'RE TOO COLD, THE

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BLOOD VESSELS IN YOUR SKIN GET

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NARROWER AND TINY MUSCLES PULL

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THE FINE HAIR ON YOUR BODY

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UPRIGHT TO TRAP AIR AND CREATE

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A LAYER OF INSULATION.

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YOUR SKIN WORKS TO REGULATE

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YOUR BODY'S TEMPERATURE AND TO

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KEEP YOU FEELING JUST RIGHT.

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AND FEELING IS SOMETHING YOUR

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SKIN DOES TOO.

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TOUCH IS THE FIRST SENSE WE

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DEVELOP, INSIDE OUR SKIN WE

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HAVE MILLIONS OF TINY TOUCH

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SENSORS THAT SEND SIGNALS TO

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OUR BRAIN, DETECTING

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EVERYTHING FROM A PRICK OF A

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PINPOINT TO OUR MOVEMENTS IN

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THE WORLD AROUND US.

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EVERYONE NEEDS HUMAN CONTACT,

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NEWBORN BABIES, EVEN LIVE

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LONGER AND BETTER IF THEY'RE

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REGULARLY TOUCHED.

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NOT ALL THE PARTS OF OUR SKIN

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ARE EQUALLY SENSITIVE THOUGH.

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LIPS AND HANDS HAVE MORE TOUCH

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SENSORS THAN OUR BACK OR LEGS.

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IF EVERY PART OF OUR BODY WAS

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DRAWN IN PROPORTION TO HOW

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SENSITIVE IT IS TO TOUCH, THIS

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IS WHAT YOUR BODY WOULD LOOK

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LIKE.

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AND WHAT PART OF YOUR BODY HAS

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THE MOST TOUCH SENSORS?

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WHY THE TIP OF YOUR TONGUE.

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YOUR SKIN HAS AN AMAZING

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ABILITY TO MEND ITSELF, WHEN

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YOU GET CUT YOUR SKIN

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AUTOMATICALLY STARTS TO BLOCK

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INFECTIOUS BACTERIA FROM

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GETTING IN AND TO KEEP FLUIDS

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FROM LEAKING OUT.

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BLOOD CLOTS AND CELLS MULTIPLY

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FROM ALL SIDES UNTIL THE WOUND

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IS HEALED.

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(MUSIC)

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THE CONDITION OF YOUR SKINS

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SAYS A LOT ABOUT YOU.

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AS YOU AGE, YOUR SKIN BECOMES

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LESS ELASTIC AND YOU GET

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WRINKLES.

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THE COLOR OF YOUR SKIN DEPENDS

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ON HOW MUCH MELANIN THERE IS

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IN IT, BELOW THE FIRST LAYERS

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OF SKIN CELLS ARE SPECIAL

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PIGMENT CELLS THAT MAKE

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MELANIN, WHEN YOUR SKIN IS

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EXPOSED TO MORE SUN, MORE

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MELANIN IS PUSHED INTO THE

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SKIN.

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PEOPLE WHO'S ANCESTORS LIVED

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IN AND AROUND THE EQUATOR HAVE

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DARKER SKIN TO PROTECT

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THEMSELVES FROM THE HARSHER

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SUN.

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THOSE WHO CAME FROM NEARER THE

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POLES DIDN'T GET AS MUCH SUN

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SO THEIR SKIN DOESN'T NEED AS

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MUCH MELANIN SO IT STAYED

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LIGHTER.

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AND FRECKLES ARE JUST BITS OF

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MELANIN IN THE SKIN.

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MELANIN CAN'T PROTECT YOUR

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SKIN COMPLETELY, IF YOU GET

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TOO MUCH SUN YOU GET A RED

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SUNBURN; SO USE SUNSCREEN

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WHENEVER YOU GO OUT INTO THE

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SUN.

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YOUR SKIN PROTECTS AND SHIELDS

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YOUR BODY.

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IT HELPS YOU FEEL YOUR WORLD

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AND SHOWS EVERYONE YOU ARE