INTEGUMENTARY SYSTEM
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Transcript of INTEGUMENTARY SYSTEM
INTEGUMENTARY SYSTEM
FUNCTION• PROTECTION• SEPARATES THE BODY FROM THE
EXTERNAL ENVIRONMENT
LAYERS• EPIDERMIS• DERMIS
LAYERS OF THE EPIDERMIS• STRATUM CORNEUM• OUTERMOST LAYER• CONSISTS OF MANY LAYERS OF DEAD
CELLS• CONTAINS KERATIN – WATERPROOF
AND PREVENTS EVAPORATION OF BODY’S WATER
• BARRIER TO PATHOGENS
LAYERS OF THE EPIDERMIS• STRATUM GERMINATIVUM• INNER LAYER • WHERE MITOSIS TAKES PLACE• CONTAINS THE CELLS THAT PRODUCE
KERATIN• CONTAIN MELANOCYTES• MELANIN AND VIT D PRODUCTION IS
INCREASED BY EXPOSURE TO UV RAYS
DID YOU KNOW…• EVERY MINUTE 30,000-40,000 DEAD
SKIN CELLS FALL OFF OR ARE SLOUGHED OFF YOUR BODY!!!!!!!! WOW!!!!!!!
• AN ALL NEW YOU EVERY MONTH!
WITHIN THE EPIDERMIS• LANGERHANS CELLS – PHAGOCYTIZE
FOREIGN MATERIAL
DID YOU KNOW…• AN ADULT WILL HAVE MORE THAN 20
SQUARE FEET OF SKIN
• YOU WILL SHED APPROXIMATELY 40 POUNDS OF SKIN DURING YOUR LIFETIME!!!!!
BETWEEN THE EPIDERMIS AND DERMIS
• PAPILLARY LAYER – ABUNDANT IN CAPILLARIES
• BLISTER – SEPARATION OF THE EPIDERMIS FROM THE DERMIS
• CALLUS – PRESSURE TO AN AREA THAT INCREASES MITOSIS
DERMIS• FIBROBLASTS PRODUCE COLLAGEN
(STRENGTH) AND ELASTIN (ELASTIC)• HAIR FOLLICLES – HAIR ROOT• NAIL FOLLICLES – NAIL ROOT• RECEPTORS – PAIN (FREE NERVE
ENDINGS), OTHER RECEPTORS (ENCAPSULATED)
• GLANDS • BLOOD VESSELS
GLANDS• SEBACEOUS – SEBUM – PREVENTS
DRYING OF THE SKIN AND GROWTH OF BACTERIA
• CERUMINOUS – CERUMEN – KEEPS EARDRUM PLIABLE
• SWEAT GLANDS – APOCRINE (AXILLARY AND GROIN) AND ECCRINE (ALL OVER BODY) FOR MAINTAINING NORMAL BODY TEMPERATURES
BLOOD VESSELS• IN A WARM ENVIRONMENT, VESSELS
DILATE TO BRING EXCESS HEAT TO THE BODY SURFACE
• IN A COLD ENVIRONMENT, VESSELS CONSTRICT TO CONSERVE HEAT
SUBCUTANEOUS TISSUE• AKA SUPERFICIAL FASCIA• FUNCTION IS TO CONNECT THE DERMIS
TO THE UNDERLYING MUSCLE• MADE OF AREOLAR CONNECTIVE TISSUE
(STRENGTH AND PROTECTION) AND ADIPOSE TISSUE (STORES FATS AND NUTRIENTS)
BURNS• FIRST-DEGREE – ONLY SUPERFICIAL
EPIDERMIS IS BURNED, PAINFUL• SECOND-DEGREE – DEEPER LAYERS OF
THE EPIDERMIS ARE AFFECTED, BLISTERED, PAINFUL
• THIRD-DEGREE – EPIDERMIS IS GONE, MAY EXTEND TO DERMIS AND SUBCUTANEOUS TISSUE, NOT PAINFUL SINCE PAIN RECEPTOR SITES ARE BURNED
RULE OF 9’S