s kin and body membranes. d ermis two layers papillary layer (upper dermal region) reticular layer...
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SKIN AND BODY MEMBRANES
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DERMIS
Two layers
Papillary layer (upper dermal region)
Reticular layer (deepest skin layer)
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DERMIS Papillary layer (upper
dermal region)
Projections called dermal papillae
Capillary loops
Pain receptors and touch receptors
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DERMIS
Reticular layer (deepest skin layer)
Blood vessels
Sweat and oil glands
Deep pressure receptors
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DERMIS OVERVIEW
Collagen fibers give skin its toughness
Elastic fibers give skin elasticity
Blood vessels play a role in body temperature regulation
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SKIN APPENDAGES
Glands Hair Hair follicles Nails
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SEBACEOUS GLANDS Produce oil
Keep skin lubricated Kills bacteria
Glands are activated at puberty
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SEBACEOUS GLANDS
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SWEAT GLANDS
Produce sweat
Widely distributed in skin
Two types Eccrine
Open via duct to pore on skin surface Apocrine
Ducts empty into hair follicles
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SWEAT GLANDS
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HAIR
Produced by hair follicle Consists of hard keratinized epithelial cells Melanocytes provide pigment for hair color
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HAIR
Hair follicle- shaft, follicle (root)
medulla (inner), cortex (outer), cuticle (cover)
Growth- 4 in./year or 2 mm/week
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HAIR
Associated hair structures
Hair follicle
Arrector pili muscle
Sebaceous gland
Sweat gland
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NAILS
Scale-like modifications of the epidermis Heavily keratinized (very hard)
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NAILS
Consists of:free edgeBodyRootCuticleLunula
Growth- 0.5 mm/week
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NAILS
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NAILS
Did you know that your fingernails grow much faster than your toe nails?
3-4 times faster!
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NAILS
Related to length of outermost finger bone Blood flow Use-stimulates growth
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SKIN INFECTIONS AND ALLERGIES
Contact dermatitis Exposures cause allergic reaction
Cold sores Caused by virus
Impetigo Caused by bacterial infection
Psoriasis Cause is unknown Triggered by trauma, infection, stress
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SKIN INFECTIONS AND ALLERGIES
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BURNS
Burns Tissue damage and cell death caused by heat,
electricity, UV radiation, or chemicals
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BURNS
Associated dangers Dehydration Electrolyte imbalance Circulatory shock
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RULE OF NINES
Way to determine the extent of burns
Body is divided into 11 areas for quick estimation
Each area represents about 9% of total body surface area
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RULE OF NINES
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SEVERITY OF BURNS
First-degree burns Only epidermis is damaged Skin is red and swollen
Second-degree burns Epidermis and upper dermis are damaged Skin is red with blisters
Third-degree burns Destroys entire skin layer Burn is gray-white or black
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SEVERITY OF BURNS
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CRITICAL BURNS
Burns are considered critical if Over 25% of body has second-degree burns Over 10% of the body has third-degree burns There are third-degree burns of the face, hands,
or feet