skin facts : grows faster than any other organ. approx. 19,000,000 skins cells on every sq. inch of...
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SKIN FACTS :• GROWS FASTER THAN ANY OTHER ORGAN.• APPROX. 19,000,000 SKINS CELLS ON EVERY SQ. INCH OF YOUR BODY• ADULTS HAVE APPROX. 8 LBS & 22 SQ. FEET • HUMANS SHED ABOUT 600,000 PARTICLES
OF SKIN EVERY HOUR- 1.5 LBS. A YEAR• EACH SQUARE INCH OF SKIN CONSISTS OF
20 FT OF BLOOD VESSELS
DUST MITE
MORE SKIN FACTS:
• THE EPIDERMIS RENEWS ITSELF COMPLETELY EVERY
2 MONTHS.• NERVE CELLS IN SKIN MAKE IT
SENSTIVE TO TOUCH, PRESSURE & TEMPERATURE
SKIN: 2 MAIN LAYERS: EPIDERMIS & DERMIS
TOP LAYER OF SKIN: EPIDERMIS• MADE OF EPITHELIAL TISSUE• ARRANGED IN FLAT SHEETS• PREVENTS DAMAGE TO THE CELLS
THAT LIE BENEATH IT• UPPERMOST LAYERS MADE OF DEAD CELLS• THE DEEPER LEVELS CONTAIN SKIN PIGMENT- MELANIN
THE 2ND LAYER : THE DERMIS
•COMPOSED MAINLY OF CONNECTIVE TISSUE
•CONTAINS NERVES, MUSCLES,
BLOOD VESSELS, HAIR FOLLICLES & GLANDS
SKIN & HOMEOSTASIS
•PRIMARY FUNCTION IS TO ACT AS A PHYSICAL
BARRIER BETWEEN THE ORGANISM & ITS EXTERNAL
ENVIRONMENT
SKIN : PROTECTS FROM H2O LOSS
• THE PRESENCE OF CELLS CALLED
KERATINOCYTES IN THE EPIDERMIS HELPS PREVENT WATER LOSS - DEHYDRATION
DEHYDRATED SKIN
SKIN : HELPS MAINTAIN BODY TEMPERATURE
• THE DERMIS WITH ITS GREAT BLOOD SUPPLY, PLAYS A PART
IN MAINTAINING THE BODY’S TEMPERATURE BY CONSTRICTION
& DIALATION OF THE BLOOD VESSELS
SKIN : HELPS MAINTAIN BODY TEMPERATURE – SWEAT GLANDS
• THE EVAPORATION OF SWEAT FROM FROM THE SKIN CAUSES
THE BODY TO COOL.
SKIN: PROTECTS US FROM DISEASE
•THE TOUGH EPIDERMIS WITH
ITS ACIDIC ENVIRONMENT MAKES IT INHOSPITABLE TO MICROORGANISMS.
SKIN FUNGUS
SKIN : GIVES US SOME PROTECTION FROM UV RADIATION
• THE LOWER EPIDERMIS PRODUCES A PIGMENT CALLED MELANIN – WHICH IS REGULATED BY GENETICS &
EXPOSURE TO THE SUN. THE DARKER THE MELANIN THE LESS LIKELY YOU ARE TO BURN.
SEVERE SUNBURN
MELANOCYTES – SKIN PIGMENT
ALBINISM
SKIN PIGMENTS
SKIN: SENSITIVITY & COMMUNICATION• FINGERS MOST SENSITIVE TO STIMULI - THE BACK THE LEAST.• CAN COMMUNICATE THE STATE OF HEALTH BY COLOR CHANGE: EX.
FLUSHED• CAN CONVEY EMOTION – BLUSHING• HELP US TO INTERACT WITH OUR ENVIRONMENT
SKIN RESPONSE : GOOSE BUMPS
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