1. The Integumentary System

2. Integument

by definition, a tough outer protective layer

in humans, the layer is called skin

3. 4. Parts of the skin

epidermis

dermis

5. Epidermis

Two proteins

• Keratin, responsible for the toughness

• Melanin, responsible for the pigment

6. Dermis

Contains nerve endings

Has capillaries

7. Main function of human integument

prevents water loss

8. Other functions

Release of metabolic wastes

Has waterproofing

Protection against solar radiation

Antibacterial action

Response to stimuli

Controls body temperature

9. 10. Other Parts of the Skin

Sweat glands

Sebaceous glands

Sensory receptors

Arrector pili muscle

Hair follicle

• Hair and nails

11. 12. What causes acne?

The pores of the skin become clogged

Sebum is stopped on the hair follicle

Bacteria infects the site and causes the redness (inflammatory response)

13. Burns

1 stdegree

2 nddegree

3 rddegree

14. 15.