Integumentary system

1
Integumentary system
2
Parts

• Skin largest organ
• Sweat glands
• Oil glands
• Hair
• Nails

3
The skin (integument)
4
Structure of skin

• 3 layers
• Epidermis
• Dermis
• Subcutaneous tissue (or hypodermis)

5
(No Transcript)
6
(No Transcript)
7
Skin layers in detail
8
EPIDERMIS
9
characteristics

• Most superficial layer
• Keratinized stratified squamous epithelium
• Avascular
• 5 layers

10
Layers of epidermis

• Bottom layer firmly attached to dermis, constant
  mitosis
• More superficial layers flatten, fill with
  keratin hard protein
• Most superficial layer dead cells, thickest

We get a new epidermis every 30 days
11
DERMIS
12
characteristics

• Under epidermis
• Dense connective tissue
• Hide of animals
• Vascularized controls body temp.
• Many nerves
• 2 layers
• Dermal papillae raised ridges

13
Dermal papillae

• Create fingerprints due to sweat
• Genetically determined
• Create friction/gripping ability

14
(No Transcript)
15
(No Transcript)
16
HYPODERMIS
17
characteristics

• Deep to dermis
• Adipose tissue
• Anchors skin to organs underneath

18
FUNCTIONS OF SKIN
19
Functions
What functions can you already name?

• Keeps water in/out
• Insulates/cushions inner organs
• Sense of touch (touch, pressure, temperature,
  pain)

20
DONT WRITE Adult skin weighs 10-11 pounds

• Protect against
• Entry of bacteria
• UV radiation (melanin protects the DNA of cells
  from mutating)

21

• Regulates temperature
• Dilation of blood vessels ? lets heat out
• Sweat ? keeps you cool

22
SKIN COLOR
23
WHAT IMPACTS/DETERMINES SKIN COLOR?
24

• 1. Melanin
• yellow-brown-black
• varies in amount and kind
• Produced by bottom of epidermis
• Sun causes cells to produce more
• Protects cells nuclei (DNA) from UV radiation

25

• Carotene
• Found in foods, orange pigment

26

• 3. oxygen-rich hemoglobin

27
BURNS
28
causes

• Heat
• Electricity
• UV radiation
• Chemicals

29
Why they are dangerous

• Dehydration
• Rule of nines
• Infection
• Dead tissue yummy for bacteria/fungi

30
DONT WRITE
An adult who has been burned, the percent of the
body involved can be calculated as follows Head
9 Chest (front) 9 Abdomen (front) 9
Upper/mid/low back and buttocks 18 Each arm
9 Each palm 1 Groin 1 Each leg 18
total (front 9, back 9) As an example,
if both legs (18 x 2 36), the groin (1) and
the front chest and abdomen were burned, this
would involve 55 of the body.
31
Classification of burns(by severity)

• first-degree burns
• Damaged epidermis
• Red and swollen
• Heal in days
• Ex sunburn

32

• Second-degree burns
• Epidermis and upper dermis
• Blisters
• Regrowth possible

33

• Third degree burn
• Damage entire skin
• Appears gray/white, blackened
• Burn area not painful
• Regrowth not possible
• Skin grafts
• scars

34
(No Transcript)