Integumentary System - PowerPoint PPT Presentation

Loading...

PPT – Integumentary System PowerPoint presentation | free to view - id: 3f480-ZjVkY



Loading


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation
Title:

Integumentary System

Description:

Integumentary System. Chapter 36. Section 3. Functions. Covers and protects the body ... Blondes have more hair than brunettes. Interesting Tidbits ... – PowerPoint PPT presentation

Number of Views:310
Avg rating:3.0/5.0
Slides: 41
Provided by: Unit15
Category:

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: Integumentary System


1
Integumentary System
  • Chapter 36
  • Section 3

2
Functions
  • Covers and protects the body
  • What does the skin protect us from?
  • Pathogens
  • Injury
  • Ultra-violet radiation

3
Functions
  • 2. Regulate body temperature
  • How does it regulate temperature?
  • Sweating
  • Dilate/constrict of blood vessels
  • Goose bumps

4
Functions
  • 3. Excretes Waste
  • What
  • wastes are
  • excreted?
  • Urea
  • as sweat

5
Functions
  • 4. Reduces water loss
  • Keeps the body from drying out!

6
Functions
  • 5. Houses sensory receptors

Chemo
Mechano
Chemo
Photo
Mechano
7
There are 2 main layers of skin
I. Epidermis
II. Dermis
8
Epidermis
  • Outer (surface) layers of skin
  • 10-30 cells thick
  • 2 Parts
  • Inner part composed of living cells
  • Outer part is of
  • dead cells

9
Epidermis Inner layers
  • Lowest layer of cells reproduce and push older
    cells toward the surface.
  • As cells near the surface, they flatten and their
    organelle disintegrate

10
Epidermis Inner layers
  • These cells also begin producing Keratin a tough,
    fibrous protein.
  • This replaces cytoplasm.

11
Epidermis Outer layers
  • The Keratin producing cells die as they move
    toward the surface.
  • Outer dead layer waterproofs and protects inner
    layers
  • It is shed continually and is completely replaced
    in 2 - 4 weeks

12
Epidermis
  • What do we find in the epidermis?
  • Melanocytes
  • What are melanocytes?
  • Cells that produce melanin.
  • What is melanin?
  • A dark brown pigment
  • What does melanin do?
  • Gives skin its color
  • Protects sensitive dermis from U-V radiation

13
Epidermis
  • Melanocytes

Do some people have more melanocytes than other
people?
NO!
14
Epidermis
  • Skin pigmentation is due to the type and amount
    of melanin produced
  • Eumelanin produces darker pigments
  • Phaeomelanin produces lighter pigments and
    freckles
  • These often occur together in varying amounts

Melanocyte
15
Dermis
  • Deeper layers of skin
  • 10-20 times thicker
  • than epidermis.
  • Top layer arranged
  • In ridges.
  • Why are there
  • ridges?

Dermis
16
Dermis
  • Ridges help the
  • epidermis bind to the
  • dermis.
  • The uneven ridges
  • create fingerprints

Dermis
17
Accessory Organs of the Dermis
  • 1. Hair follicles tube-like depression where
    the hair develops

18
Accessory Organs of the Dermis
  • 2. Sebaceous glands secret oily sebum to soften
    and waterproof skin

19
Accessory Organs of the Dermis
  • 3. Nails protective covers of ends of fingers
    and toes.

20
Accessory Organs of the Dermis
  • 4. Sweat glands
  • secrete waste
  • regulate heat
  • produces ear wax
  • produces milk during lactation

21
Accessory Organs of the Dermis
  • 5. Blood vessels to nourish skin cells

22
Accessory Organs of the Dermis
  • 6. Nerves to send and receive messages

23
Accessory Organs of the Dermis
  • 7. Erector pilli muscle
  • -smooth muscle
  • -causes
  • goosebumps
  • -causes
  • hair to
  • stand erect

24
Subcutaneous layer connective tissue
  • Anchors dermis to the body
  • Contains fat
  • cells to
  • protect
  • and cushion

Subcutaneous layer
25
So lets review
L.
M.
I.
  • Blood vessels
  • Connective tissue
  • Dermis
  • Epidermis
  • Fat cells
  • Hair
  • Hair follicle
  • Muscle
  • Neuron
  • Sebaceous gland
  • Subcutaneous layer
  • Sweat gland
  • Sweat pore

H.
A.
B.
A.
G.
K.
L.
B.
J.
J.
F.
D.
C.
I.
K.
C.
D.
H.
E.
E.
M.
F.
G.
26
Disorders of the Skin
  • Acne infection of sebaceous gland

27
Disorders of the Skin
  • Benign tumor fleshy growths on neck, armpits
    and body.
  • Harmless!

Tumor
28
Disorders of the Skin
  • Vascular Birthmarks Blood vessel abnormality
    affecting .5 of population darkens skin

29
Disorders of the Skin
  • Dermatitis dry, sensitive skin

30
Disorders of the Skin
  • Nail Fungus

31
Disorders of the Skin
  • Fungal infections

Ring Worm
Athletes Foot
32
Disorders of the Skin
  • Impetigo bacterial infection

33
Disorders of the Skin
  • Psoriasis chronic inflammation

34
Disorders of the Skin
Melanoma
  • Cancer

Carcinoma
35
Disorders of the Skin
Common wart
  • Warts- viral infection

Plane warts
Plantar wart
36
Disorders of the Skin
BurnsFirst degree Second degree Third
degree
37
Interesting Tidbits
  • Your body is composed of approximately 100
    Trillion cells
  • About 16 of your body weight is skin
  • The skin is completely renewed every 27 days
  • You will make almost 1000 new skins in a lifetime
  • If all the layers of your skin were laid out on
    the ground, it would cover about 20 m2 or 2
    parking spaces

38
Interesting Tidbits
  • A fingernail or toenail takes about 6 months to
    grow from base to tip
  • Fingernails grow faster than toenails
  • An average human scalp has 100,000 hairs
  • We lose between 40 and 100 hairs per day
  • Blondes have more hair than brunettes

39
Interesting Tidbits
  • Fingerprints provide traction for grasping
    objects
  • Even identical twins have different fingerprints
  • Every square inch of dermis contains twenty feet
    of blood vessels
  • Skin on our hands and feet is thicker. When we
    bathe, skin takes on water and swells slightly.
  • In the thicker areas, increased surface area
    creates crowding. The skin must wrinkle to
    accommodate the changes

40
Interesting Tidbits
  • Friction of the epidermis causes cell division to
    increase.
  • This outward thickening is called a callous.
  • Sometimes growth is inward, creating a corn.
  • Humans shed about 600,000 particles of skin per
    hour about 1.5 pounds per year.
  • At age 70, you will have lost about 105 lbs of
    skin.
About PowerShow.com