Objective
October 3, 2011

In our study of
The Integumentary system
The students will be able to
Describe (comprehension) the main main functions
and organs
And show what they learned by
Constructing (evaluation) a model of the skin
section
Warm-Up
 What
are the limitations of
using a skeleton model to show
how muscles enable
movement.
The Integumentary System
Watch this !!

http://www.youtube.com/watch?v=uH_uzjY
2bEE&feature=fvst
The Integumentary System

Made of skin, hair, nails, and sweat glands
The skin Largest organ of your body
Functions of skin
It protects
 Regulates
temperature
 Includes your
touch senses
 Secretes oil

There are three layers of skin
Epidermis
Dermis
Subcutaneous
layer
Strong and
flexible
 Protective outer
covering
 First line of
defense from
germs

Epidermis
Dermis

Nourishes
your skin
through
blood
vessels
Subcutaneous layer
Provides a cushion to your inner organs
 Provides insulation to keep you warm

Hair
Grows about
1.5 cm per month

Protects your
skull
 Filters dust
from entering
your eyes and
nose and ears

Hair
Nails

Grow
1 inch
per year
Nails

Protects the ends of your fingers and toes
Sweat
Glands
Release
About 1
Liter per
Hour of
exercise

Sweat Glands
Keep you cool as the sweat evaporates
from your skin
 Releases excess salt

First Degree Burn – like a sunburn
Second Degree Burn
Third Degree Burn – requires new
skin to be put over the burns; goes
into the second layer the dermis
Insect Bites – cause itching and
swelling
Skin Cancer
Can be cured if caught early
Sqaumous cell carcinoma
Basal cell carcinoma
Melanoma
Missing fingernail from nail fungus
Reflection:

What are the main functions of the
integumentary system. List them in your
journal.
Integumentary
System
Skin, Nails and Hair—Oh My!
Procedures to Skin Lab
1.
2.
3.
4.
Press the tape to the back of your hand
Remove tape quickly
Look at the sticky side of tape under the
hand lens
Draw the dead skin cells
Procedures to Hair Lab
1.
2.
3.
Pull 1 hair from your head
Examine both ends of the hair shaft
under the hand lens
Draw what you observed
Procedures to Nail Lab
1.
2.
Use a hand lens to observe your
fingernails
Draw what you observed
Skin cells from hand
Hair out of head
Compare the three parts of the integumentary system.
Fingernail
Hair is composed of…

Strong, dead protein
called keratin



Keratin is a protein that
makes up the nails and
outer layer of skin
Hair, skin and nails
form from dead cells
The dead cells will shed
when new cells push up
from the underneath