1. SKIN is IN!
Objective: To learn the structure and function of the Integumentary System
Bell Work:
On the surface of your fingers are unique little ridges, called fingerprints. What do you think is their purpose?
They provide your grip. Without them, things would just slide right out of your fingers!
Are any two sets of fingerprints alike? Explain.
Nope, not even identical twins have the same prints. Your prints are formed as a result of the swirling of fluid in the womb as you grow!
On click, answers to bell work will appear.
© 2014 Getting Nerdy, LLC

2. Made up of the hair, nails, and skin
© 2014 Getting Nerdy, LLC

3. Made of the protein “keratin,” grows from follicle
Hair:
Made of the protein “keratin,” grows from follicle
Found all over body except lips, palms and soles of feet
Functions in warmth, protection, and immune defense
Characteristic of mammals
Oil Gland
Follicle
Muscle
Hair Shaft
Epidermis
Dermis
© 2014 Getting Nerdy, LLC

4. Made of the protein “keratin,” grows from root
Nails:
Made of the protein “keratin,” grows from root
Found on fingers and toes (phalanges)
Functions in protection and as a tool for precise activities
Free Margin
Nail Plate
Nail Bed
Lunula
Matrix
Root
© 2014 Getting Nerdy, LLC

5. Skin:
Your skin is the largest organ of your body and is made up of three layers of tissue:
Epidermis: outer layer composed of epithelial cells
Outermost cells are dead and rub off
New cells are constantly made at the base/bottom of the epidermis.
Melanocytes: cells produce melanin - pigment that protects your skin and gives it color
Dermis: the middle layer composed of connective tissue
Contains blood vessels, nerve fibers, muscles, oil, sweat glands, and other structures.
Hypodermis (fatty layer): below the dermis - insulates body
© 2014 Getting Nerdy, LLC

6. Human Skin Cross-section magnified 100x
EPIDERMIS
DERMIS
Human Skin Cross-section magnified 100x
© 2014 Getting Nerdy, LLC

7. Skin Cross-section Epidermis Dermis Hypodermis Hair from hair follicle
Sweat Gland
Oil gland
Nerve
Blood Vessels 4 1 5 6 2 7 3 8
© 2014 Getting Nerdy, LLC

8. Sense our environment through touch
Function:
Forms a protective covering over the body which prevents infection and water loss
Sense our environment through touch
Formation of Vitamin D during exposure to the sun
© 2014 Getting Nerdy, LLC

9. Regulation of body temperature
Blood vessels in skin help release/hold heat
Perspiration (sweating) to keep cool and shivering to keep warm
© 2014 Getting Nerdy, LLC