1. Skin Functions (pg 8)

2. Protection
• Skin protects underlying tissue from
mechanical, chemical, and thermal injury

3. Protection
• Skin protects underlying tissue from
mechanical, chemical, and thermal injury
• Keratin waterproofs the cells, preventing
fluid loss and gain through the skin

4. Protection
• Skin protects underlying tissue from
mechanical, chemical, and thermal injury
• Keratin waterproofs the cells, preventing
fluid loss and gain through the skin
• Skin provides the first line of defense
against bacteria and other pathogens

5. Protection
• Skin protects underlying tissue from
mechanical, chemical, and thermal injury
• Keratin waterproofs the cells, preventing
fluid loss and gain through the skin
• Skin provides the first line of defense
against bacteria and other pathogens
• Melanin absorbs UV light

6. Sensory Reception
• Dermis contains sense receptors for heat,
cold, pain, touch, and pressure

7. Sensory Reception
• Dermis contains sense receptors for heat,
cold, pain, touch, and pressure
• Receptors clustered around hair follicles
can detect if the hair moves

8. Temperature Regulation
Skin regulates body temperature in 2 ways:
1. Sweat glands
2. Dilation and constriction of blood vessels
in the dermis

9. Negative Feedback
Blood vessels dilate
Sweat glands become active
Body temp rises
Above normal
Body heat is lost to surroundings
And body temperature decreases
Normal Body Tempature 98.6 F

10. Negative Feedback
Blood vessels dilate
Sweat glands become active
Body temp rises
Above normal
Body heat is lost to surroundings
And body temperature decreases
Normal Body Tempature 98.6 F
Body heat is conserved
And body temperature increases
Body temp falls below normal
Blood vessels constrict
Sweat glands become inactive

11. Synthesis of Vitamin D
• Skin cells contain a precursor molecule
that is converted to vitamin D when
exposed to UV light

12. Synthesis of Vitamin D
• Skin cells contain a precursor molecule
that is converted to vitamin D when
exposed to UV light
• Vitamin D is essential for bone
mineralization

13. Synthesis of Vitamin D
• Skin cells contain a precursor molecule
that is converted to vitamin D when
exposed to UV light
• Vitamin D is essential for bone
mineralization
• Limited sun exposure can lead to vitamin
D deficiency, which can result in
osteoporosis and other chronic disorders

14. Output (pg 9)
• Write a song about the functions of the
skin
• Must be at least 10 lines long
• Give the song a title and say what it is to
the tune of