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43 Cards in this Set

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Integumentary system
skin and associated accessory organs, glands and structures
cause of psoriasis
caused by cells dividing up to 7x faster than normal
Dermatitis
an inflammatino of the dermis
Contact Dermititis (2)
Allergic-Exposure to allergen e.g.-poison ivy

Irritant-exposure to irritant e.g, cosmetics, soapy H20
Dermis
fibers(resulting in thinner skin)-sebum(oil)-hair melanin follicles, nail blood supply, # nerve receptors, # lymphocytes, sweat glands, vasomanipulation ability, blood vessels, vit. D activation
Dermis characteristics
a.Irregular dense connective tissue(collagen,elastic fib.)
b.smooth muscle fibers(hair follicles, scrotum, facial expression)
c.nerve cells-both motor+sensory)
blood vessels
e.glands(sweat+sebbaceous)
f.Hair follicles
Subcutaneous characteristics
a.Loose connective tissue
b.adipose tissue
c.blood vessels
d.nerves
Function of Hair follicles
produce hair and release sebum(oil)
Root of hair follicle
portion embedded in skin
papilla of hair follicle
nutritive bud of connective tissue and vessels
shaft of hair follicle
portion of hair that exits follicle
Arrector pilli muscle of hair follicle
smooth muscle that stands hair up
Cause of Alopecia(hair loss)
result of fever, low estrogen levels, genes, meds and autoimmune disorders
Sebaceous glands
(oil glands)-holocrine gland that secretes sebum(fatty oil+cells). Associated w/follicle. function: reduce dessification, water proofing, preserve hair
What causes acne?
Excess sebum secretion results in acne due to plugged ducts.
Sweat glands
Ducts w/ coiled base
Function:reduction of toxins, thermoregulation, etc.
Eccrine (function)
thermoregulation, waste elimination
sweat gland
apocrine (function)
wetting of skin and scent production, especially during times of excitement.Open into follicles
sweat gland
Ceruminous (function)
produce ear wax
sweat gland
mammary (funtion)
produce milk
sweat gland
salivary (funtion)
produce saliva for digestion
sweat gland
Nails (funtion)
Defense, grip
sweat gland
Hypothermia
below normal body temp.
thermoregulation by the skin
Hyperthermia
Abovenormal body temp.
thermoregulation by the skin
Teperature reduces through:(5)
a.radiation
b.conduction
c.convection
d.evaporation
e.vasolidation
thermoregulation by the skin
Genes
# of melanocytes equal between races. color functions amount of melanin produced and size of granules
Fators affecting skin coloration
color depends on what?
activity of melanocytes
*dark skin=large granules
*light skin=small granules in clusters of 2-4
factors affecting skin coloration
Enviromental
UV exposure ups increases melanin production
factors affecting skin coloration
physiology
e.g.increase of O2, increases redness;decrease of 02 increases blueness;excitement increases redness; increase of bilirubin increases yellowness(jaundice),aging, sun exposure, pregnancy mask
factors affecting skin coloration
Temperature increases through: (4)
a.vasoconstriction
b.shivering
c.conduction
d.convection
thermoregulation by the skin
Skin Repair
Damage occurs-clot formed-fibroblasts secrete collagen fibers to bind margins-growth factors released to stimulate mitosis-phagocytes remove debris-regenerating cells push off scab
how a cut heals
does chance of scarring formation increase or decrease when size of wound increases?
increases
forms more collagen fiber
first degree
-reddened, edema, + possible peeling of epidermis
Burns
(superficial partial thickness)
second degree
capillary drainage and blister formation and peelin affects epidermis and dermis.
Burns
(deep partial thickness)
third degree
destruction of epidermis, dermis, and associated organs and subcutaneous.
(flame=carbonization of skin)
Burns
(full thickness)
Diet
from eating plants containing carotene pigment
(ex.pumpkins, carrots...)
factors affecting skin coloration
epidermis
maintains thickness, mitosis decreases, cells larger + irregular in shape, keratin changes shape relulting in scaly skin, "age/liver spots" appear
Aging of Skin
Dermis
decrease of: fibers(resulting in thinner skin), sebum, hair melanin, follicles, nail blood supply, # nerve receptors, # lymphocytes, sweat glands, vasomanipulation ability, blood vessesls, vit. D activation
Aging of the Skin
Subcutaneous
decrease fat, dec. fibers and fat cause sagging skin and wrinkles
Aging of the Skin
Serous
line cavities that do not open to ouside, cover organs
f: reduce friction via serous fluid prod.
epithelial membranes
Mucous
line cavities that do open to ouside
f:prevent dessification, reduce friction, trap debris w/mucous via goblet cells
epithelial membranes
Cutaneous(skin)
Interphase between body and external enviroment
f:prevent dsseification, reduce abrasion, resist infection, sense enviroment, vit. activation, waste elimination.
epithelial membranes
epidermis: (4) characteristics
a.lack vasculinization
b.increase in # of desmosomes
c.keratinized(cornified) @ surface
d.melanocytes-f:production of melanin to decrease UV damage
Components of Cutaneous membrane(skin)