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20 Cards in this Set

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  • Back
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Skin
-made of keratin
-k = waterproof protein

-grows in layers
-repairs itself

-loose connective tissue = stretchy

-barrier, protects, keeps out bacteria, retains body fluid, regulates body temp, eliminates waste
made of
job
strech
Skin
Epedermis
-outer layer

-shed skin when it grows

-dead, flat skin cells

-hair follicles

-Basal Layer: bottom living layer (blood diffuses by osmosis thru blood vessels to basal)


-melanocysts in basal
where
made of
contains
bottom layer
shed
Skin
Dermis
-inner layer

-live cells

-blood vessels, glands (sweat=cool, oil=smooth skin), sense nerves, muslce fibers (goose bumps)

-fat layer beneath it
made of
contains (4)
underneath...
Nails
-keratin, modified hairs, protein

-cells grow under skin at nail root around base/sides of nail plate

-3-6 months for complete growth (continuous)
-excersize = faster growth
-made of
growth
length of growth
Nail
Parts
Nail Matrix- area in which nail grows

Nail Plate- clear nail part

Nail Bed- holds nail in place w/skin (tissue + blood vessels)

Opinchium- cuticle
4 of them
jobs
where
look
Nail
Injury
Hangnail- torn skin around nail
-due to dry skin/bite

Ingrown Nail- nail plate grows into nail bed
-due to tight shoes, genes

Leukonychia- (white spots) damaged matrix
-often = need more zinc
-where
why
Hair
Hair follicle- cluster of cells in epedermis

1-cells grow at hair root (fed by tiny blood vessels)

2- pushes up shaft (visible hair)

3-cells die as they move up shaft away from blood vessels

4-become hard keratin

-scalp hair grows continuously
-others grow 2 years, fall out

-protect, insulate, regulate temp
-hair follicle
growth
becomes...

growth length
job
Tanning
-melanocysts in epedermis basal layer release melanin

-melanin (pigment) protects body from sun rays

-skin = dark
where
what
when
result
Tanning
Dangers
1- Not enough melanin to prootect skin

2-Rays go to in skin

3-Sunburn (red, pain, inflammed, peeling)

4-Repeated Sunburn...

5-SKin Cancer:
-sun mess up DNA
-modifies cell genes
-replicate = tumor


-premature aging of skin
cause
leading to sunburn
skin cancer
how

other danger
Tanning Prevention
-stay out of sun between 10-2

-wear protective layers

-SPF 30+
-reapply often
-waterproof

-don't wait for burn symptoms (takes 2-4 hours to show)
examples:
when
what do
Coloration Skin + Hair
-hereditary

-melanocystes produce melanin (pigment)

Eumelanin (brown/black hair)
Pheomelanin (red)
Low Melanin (blond)

Melanocysts don't work (gray)
-cause
specifics
gray
Moisturizers
-have water + oil

-water diffuses in epedermis skin cells thru ossmosis
-plumps them up
-oil keeps water from evaporating
cotain
how work
Wrinkles
Young:
-have elastin + collagen in loose connective tissue
-skin retains water well

Old:
-skin loses elastin/collagen
-can't retain water well
-skin = thinner

Result:
-fat dissapears
-epedermis sags



Alpha-Hydroxy Cream-
-water diffuses in cells in folds in skin
-plumps them up
-oil holds it in
young
old
result

alpha hydroxy cream
Sweat
-sweat glands in dermis/epedermis in hair follicle

-excretory organ = release excess water, urea, salts

-regulates body temp:

1-body temp increases

2-Stimulates glands in hair follicles to release sweat

3-water evaporates w/heat + skin is cooled
where
job
how job
Sweat
Yellow
BO
BO:
-bacteria mixes w/sweat in hair follicle
-metabolizes protein

Yellow:
-sweat has carbs in it
cause
Sweat
Antiperspirants
-clog/block pores w/astringents so they can't release sweat
-body can't cool

-deo neutralizes smell
job
how
result
Acne
-plugged pores
-gene triggers puberty, triggers hormones

1-increase in hormone level

2-oil glands more active

3-sebaceous follicle (S gland + hair follicle) make pore

4-oil secretions of sebum (fatty substance) build up underneath + plug it up

5-bacteria enters
WBC fight

=pimple
other name
puberty role
cause
Acne
Treatments
-to prevent acne
-improve acne
-prevent scarring

-decrease sebum production, reduce bacteria, eliminate inflammation
purpose
how
Blisters
1. Skin rubs against something

2. Rubs off inner layer of skin but not outmost

3. Serum (fluid) enters from nearby tissues as result of damage
cause
effect
Calluses
1. area often rubbed, irritated, blistered

2. skin cells in are die often

3. dead cells accumulate + harden/thicken

4. protects against pressure,friction,injury
cause
effect
job