1. 3.06 Understand the functions of the Integumentary System

2. Essential Questions:
What are the functions of the integumentary system?
How do you relate the integumentary system to the body’s communication systems?
3.06: Understand the functions and disorders of the integumentary system

3. Functions of the Integumentary System
What are the functions of the skin?
Absorption:
the skin is able to soak up topical medications
Excretion:
the skin is able to produce sweat to help cool the body down and oils to help moisturize and protect the skin
Production of vitamin D:
UV rays help the skin to manufacture vitamin D 1 2 3

4. Functions of the Integumentary System
What are the functions of the skin?
Protection:
The skin keeps bacteria, helps to stop dehydration, and prevents injury
Temperature Regulation:
The skin helps by controlling the amount of heat loss 4 5
3.06: Understand the functions and disorders of the integumentary system

5. Functions of the Integumentary System
What are the functions of the skin?
Sensory Perception:
Skin is the site of many nerve endings, pain, pressure, hot cold, sweat and oil
Storage:
Skin is a temporary storage place for glucose, water and nutrients 6 7
3.06: Understand the functions and disorders of the integumentary system

6. Functions of the Integumentary System
What structures are involved in these functions?
Follow the notes on next slides
Epidermis
Dermis
Appendages
Glands
3.06: Understand the functions and disorders of the integumentary system

7. Functions of the Integumentary System
Epidermis
Protective outer layer
It has a waterproof covering that keeps skin from drying out.
3.06: Understand the functions and disorders of the integumentary system

8. Functions of the Integumentary System
Epidermis
What do melanocytes do?
Melanocytes - produce melanin, which protects skin from UV rays
3.06: Understand the functions and disorders of the integumentary system

9. Functions of the Integumentary System
Epidermis
What is a major function of intact skin?
Intact skin fights off infections - no way to get into the body
3.06: Understand the functions and disorders of the integumentary system

10. Functions of the Integumentary System
Epidermis
The epidermis is composed of dead and living cells. What in their relevance to health?
Skin has new and old cells, old cells flake off, new rise up replacing old or damaged cells
3.06: Understand the functions and disorders of the integumentary system

11. Functions of the Integumentary System
Epidermis
Why are some people dark and others fair?
Can that be changed?
Number of melanocytes - genetics
3.06: Understand the functions and disorders of the integumentary system

12. Functions of the Integumentary System
Dermis
Is the true layer of skin
It is vascular
Brings heat to the surface for cooling

13. Functions of the Integumentary System
Dermis: Contains:
Connective tissue
Collagen tissue bands
Elastic fibers
Numerous blood vessels
Nerve endings
Muscles
Hair follicles
Oil glands
Sweat glands
Fat cells

14. Functions of the Integumentary System
Subcutaneous layer
Hypodermal layer
Hypo dermal
Hypo - under
Dermal - skin
3.06: Understand the functions and disorders of the integumentary system

15. Functions of the Integumentary System
Subcutaneous layer
What are the benefits of the subcutaneous layer of skin?
Under dermis
Consists of fat cells
Contains 50% of body’s fat stores
Protects the internal body from injury

16. Functions of the Integumentary System
Hair
What is the function of hair?
It helps keep the body warm
All skin has hair except palms and soles of feet
3.06: Understand the functions and disorders of the integumentary system

17. Functions of the Integumentary System
Hair
What factors influence hair type and color?
Genetics from both parents determine hair color and hair type.
3.06: Understand the functions and disorders of the integumentary system

18. Functions of the Integumentary System
Hair
What happens to your hair when you are cold? Why?
Goosebumps:
Occur when arrector pili muscle is attached to each hair contracts when body is trying to keep warm
Can also occur when frightened

19. Functions of the Integumentary System
Nails
The nail bed underneath the nail is called the matrix
Lunula: half moon at base of nail
3.06: Understand the functions and disorders of the integumentary system

20. Functions of the Integumentary System
Nails: What does the condition of a person’s nails tell about their general health?
White nails - liver disease
Half pink/half white - kidney disease
Nail bed red - heart condition
Yellow and thickening nails - lung disease
Pale nail bed - anemia
Yellowish with a slight blush at the tip -
diabetes
Bluish in color - hypoxia

21. Functions of the Integumentary System
Glands: Sudoriferous glands (Sweat Glands)
Excrete certain wastes dissolved in perspiration
Function is to cool body
Excreted sweat is 99% water with only small quantity of salt
Why does sweat smell bad?
Bacteria on skin cause odors

22. Functions of the Integumentary System
Glands: Sebaceous glands:
Protect skin by secreting oily substance known as sebum
Sebum lubricates skin and keeps it soft and pliable
What causes pimples?
Skin pores become blocked with sebum
Pimple

23. Functions of the Integumentary System
review
What are the 7 functions of the skin?
What structures are involved in these functions? 1 5 3 7 4 2 6
3.06: Understand the functions and disorders of the integumentary system

24. Essential Questions:
What are the functions of the integumentary system?
How do you relate the integumentary system to the body’s communication systems?
3.06: Understand the functions and disorders of the integumentary system