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Transcript 
What you will do today . . .
-Name the largest organ of the
integumentary system
-List the general functions of the skin
-Describe the structure of the layers of the
skin
The Integumentary System
Skin: The Largest Organ!
What are the functions of the skin?
1. Protection
2. Contains sensory devices
3. Gets rid of waste material
The layers of the skin
1. Epidermis
a. Composed of
squamous
epithelium
b. Made mostly of
dead cells
c. Cells are filled
with a protein called
keratin
d. Melanin to
absorb UV radiation
The layers of the skin
2. Dermis
a. Sensory neurons
b. Blood Vessels
c. Muscle fibers
d. Hair follicles
e. Glands
The layers of skin
3. Layer of fat cells
Nails and Hair
1. Protect the body
2. Grow throughout life
3. Made of proteins
Glands
1. Exocrine glands
a. Sweat
b. Oil
c. Release secretions through pores
2. Acne results from oil glands being
clogged
References
• http://www.rogers.k12.ar.us/users/ehutche
s/SKIN.gif
• http://content.answers.com/main/content/w
p/en-commons/thumb/3/3d/300px-Skin.jpg
• http://www.wiredtowinthemovie.com/image
s/hotspots/level03integumentary.jpg
• http://library.thinkquest.org/3007/skin.jpeg
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