1. Do Now: Design the Perfect Coat

2. Major roles of the Integumentary System
Protection
Maintenance of normal body temperature
Storage of fat
Synthesis of vitamin D
Excretion wastes
Sensory perception

3. How the skin performs the function Why this function is important
Function of skin
How the skin performs the function
Why this function is important
By covering our entire body
Helps maintain homeostasis
Protection
Maintain body temperature
Sweating, shivering, has insulation
Helps maintain homeostasis
Gives us energy stores and insulates
Turns food into fat under the skin
Stores fat
Uses the sunlight to make it
We don’t get enough vitamin D from food
Synthesis of vitamin D
Wastes could become toxic
Excretion of wastes
Sweating
Sensory perception
Allows you to react to danger
Nerves in the skin
Function of skin
How the skin performs the function
Why this function is important

4. The Skin: 3 Major layers

5. The Epidermis
The epidermis is the outer layer of skin. It is the thinnest layer.
Cells of the epidermis are constantly shedding and replacing themselves…
That’s what makes you ashy

6. The Epidermis
Cells are shaped like columns at the base and flatten as they move upward.
The top layer is constantly removed.
It does not have any blood vessels.

8. Epidermis has special functions:
Produces pigment (melanin)
Frontline defense of the immune system
Have highly sensitive touch receptors (neurons)

9. The Dermis This is the second layer of skin
It is the thickest layer and has the most components

10. Specialized Dermal Parts
Hair follicles begin in the dermis and have the cells needed to grow hair
Sebaceous glands and sweat glands are also in the dermis.
Blood vessels and nerves course through this layer.

11. Glands Galore! Sebaceous glands
Sebaceous glands are located near the hair follicle and produce sebum - the natural oil of your skin.
Sebum is a mixture of different waxes and fats.

12. Sweat Glands Sweat glands
Unlike sebaceous, they do not use the hair follicle to exit sweat to the skin
Each has its own pore.
Sweat glands regulate body temperature.
Sweat is also helpful in eliminating waste from the body.

13. Nerves and Blood Vessels
The nerves transmit sensations of pain, pressure, itch, and temperature.
The blood vessels facilitate temperature homeostasis.
They get bigger to release heat, causing your skin to get red.

14. The Hypodermis This is the third layer of skin
It is the simplest layer
It contains big blood vessels and fat

15. Review: Epidermis and Dermis

16. Question 1
Which of the following are NOT functions of the integumentary system?
Protection
Makes vitamin D
Controls movement
Maintains body temperature

17. Question 2
What do sebaceous glands produce?
Sweat
Oil
Hair
Fat

18. Question 3 Blood vessels are in both the dermis and epidermis.
This is a TRUE statement.
This is a FALSE statement.

19. Question 4
Which of the following specialized cells are NOT in the epidermis?
Melanocytes
Merkel Cells
Sebaceous glands
Langerhan’s Cells

20. Question 5 Sweat glands use the hair follicles to release sweat.
This is a TRUE statement.
This is a FALSE statement.

21. Question 6 Structure 1 is: Sweat gland Sebaceous gland Hair follicle
Dermis
Epidermis 3 2 1 4

22. Question 7 Structure 2 is: Sweat gland Sebaceous gland Hair follicle
Dermis
Epidermis 3 2 1 4

23. Question 8 Structure 3 is: Sweat gland Sebaceous gland Hair follicle
Dermis
Epidermis 3 2 1 4

24. Question 9 Structure 4 is: Sweat gland Sebaceous gland Hair follicle
Dermis
Epidermis 3 2 1 4