 In
adults the skin covers an area of about 22
square feet
 The skin is the largest organ in the body
 The skin weighs about 10-11 pounds
 House dust is mainly skin flakes!
 What hurts if you pull it, but doesn't hurt if
you cut it?

Your hair, of course!
 Skin
is elastic - it springs back into shape
when stretched.
 Some medicines (estrogen, nicotine) can pass
through the skin, but others cannot (insulin).

Why is that? Because only fat-soluble substances
can enter the skin, not water-soluble ones.
1.
2.
3.
4.
5.
Skin
Hair
Nails
Glands
Sensory
receptors
1.
2.
3.
4.
5.
Regulate body
temperature
Protection
Detects
sensations
Excretes and
absorbs
substances
Synthesizes
vitamin D
Epidermis
1.


Dermis
2.

3.
Layers of keratinized
epithelial cells
Mostly dead cells
Specialized
structures
Subcutaneous
layer
(hypodermis)
What shape would the skin cells have?
They would be stratified squamous cells
 Seven
 Thick


vs Thin
Thicker in high
friction areas
Ex. feet
 Langerhans

cells
Recognize foreign
cells
 Merkel
cells and
Tactile disks

Detect touch
 Keratin

Waterproofs skin
 Melanin


Provides color and
UV protection
Color ranges from
yellow to black
 Made
up of dead
epidermal
keratinized cells


What is the function
of hair?
What is the function
of the arrector pili
muscle?
 Color
produced by
melanin

What about white
or grey hair?
 Eccrine
sweat
gland


Regulate body temp
Release sweat in
response to emotion
 Apocrine
sweat
glands


Do not function
until puberty
Sweat is odorless
Where does BO come from?
 Acne

http://www.youtub
e.com/watch?v=lAx
5gwhmsdo
 What
causes acne?
Blackheads?
The science of tattoos
 https://www.youtube.com/watch?v=DMuBif1
mJz0
Face Lift
 http://www.youtube.com/watch?v=hEJ2KnrO
xSg
 Which
layer of skin
is ink deposited in?
Why?
 What would
happen to a tattoo
if the ink was
injected into the
epidermis? Explain
your answer.
Which trends are popular among your
peers?
2. What are other forms of body
augmentation?
3. What risks are involved with certain types
of body augmentation?
Liposuction Clip
http://www.youtube.com/watch?v=nfRsBijqS4
E&oref=http%3A%2F%2Fwww.youtube.com%2Fw
atch%3Fv%3DnfRsBijqS4E&has_verified=1
1.
Elaine Davidson
4. Should teens be allowed to augment their
bodies? Why or why not?
Teen Plastic Surgery Clips
https://www.youtube.com/watch?v=iVf4uquOy
Xw
https://www.youtube.com/watch?v=sFAcgWOH
2Mg
 https://www.youtube.com/watch?v=XGyYuz1
aMGU
 https://www.youtube.com/watch?v=F2cLuvX
oFjE
3



pigments
Melanin
Hemoglobin
Carotene
Sun Exposure:
 Necessary to
produce vitamin D
 Increased exposure
can lead to . . .?
 Overgrowth


Size
Quantity
 What

of cells
happens?
DNA damage leads
cell cycle not working
correctly
 Hard
dead
keratinized cells
 Why is the nail
body pink but the
lanula a whitish
color?
http://www.youtube.com/watch?v=4i
JVWMR4Uq0&list=PL6SJY8nLqZousdoE53-Al4O_XAOR9CjA
The Fugate Family
http://www.youtube.com/watch?v=ahi
hGKZC5Kk
Paul Karason
 Cyanotonic


Blood is not picking
up enough oxygen
Skin turns bluishpurple
 Erythmea
Redness of skin
 Capillaries engorged
with blood
 Heat, infection,
inflammation, etc.

 Yellow
skin and
whites of the eyes
 Excess bilirubin in
blood
 Indicates liver
disease in adults
 What about
infants?
 http://www.youtub
e.com/watch?v=CN
Q_uW66LfU
 What can cause skin
to be burned?
 1st
degree burns
 2nd
degree burns
 3rd
degree burns
1st and 2nd



Cool burn
Cover with gauze
Pain reliever
3rd




Don’t cool
Don’t remove
clothing
Elevate burnt part
Cover
 Needed
when the
stratum basale and
stem cells are
destroyed.
 Is a transfer of
healthy skin to a
donor site
 Describe the
process of a skin
graft

http://www.youtube.com/watch?v=7ZYrw2f
Yk8U&oref=http%3A%2F%2Fwww.youtube.co
m%2Fwatch%3Fv%3D7ZYrw2fYk8U&has_verifi
ed=1
 Wrinkles
during
prolonged
exposure

Sebum is washed
away
 Why
does the skin
get “puffy”?
Dead cells swell,
living do not
 Provide surface area
to grip objects

You attempt to re-warm a hypothermic patient
using hot water and zip-lock bags. Your attempt
was thwarted when you attempted to remove
the zip-lock which had adhered to the skin. The
skin in the affected areas was removed when you
took the bag off. The bags were placed over the
entire body except the head, neck and
perineum.
 What percentage of the
body was burned?
 Which degree burn did
your patient suffer from?

A
toddler spills a steaming cup-o-noodles
over her the left side of her head and her
left anterior torso. She develops blistering,
redness and intense pain over the affected
areas of her body. She later develops a
fungal infection.
a) What percentage of her body is burned?
b) Which degree burn is she suffering from?

A boiler explodes and burns an unsuspecting
victim who has walked by mid-blast. His entire
body is burned with the exception of his
perineum and right anterior thigh.
What percentage of
his body is burned?
 Which degree is burn is
your patient suffering
from?

A
mechanic is working on a car. Gas is
accidentally sprayed on his arm which then
catches fire. He was wearing a jacket at the
time of the accident, which ended up being
burned into his skin.
a) Would it be wise to attempt to remove the
jacket from his body? Why or why not?
b) What percentage of his body has been
burned?
c) Which degree of burn is your patient
suffering from?