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Chapter 4: Integumentary System

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Chapter 4: Integumentary System Entry Task 1/7 Brainstorm AND record 3 possible functions of the integumentary (skin) system Wednesday 1/7 Mini-Quiz: Body ... – PowerPoint PPT presentation

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Title: Chapter 4: Integumentary System


1
Chapter 4 Integumentary System
2
Entry Task 1/7
  • Brainstorm AND record 3 possible functions of
    the integumentary (skin) system

3
Wednesday 1/7
  • Mini-Quiz Body Tissues
  • Begin CH 4 Skin Body Membranes
  • Worksheet Skin Structure
  • Take notes from PowerPoint
  • Integumentary System
  • Function Melanin
  • p.108-114

4
Skin Body Membranes
  • Epithelial tissue membrane (3 types)
  • Cutaneous
  • Stratified squamous on a layer of dense fibrous
    connective tissue
  • Mucous
  • Stratified squamous on simple columnar
  • Serous
  • Simple squamous on areolar tissue

5
A Closer Look at the Serosa
  • Parietal layer
  • lines ventral cavity, folds on itself to form
    visceral layer
  • Visceral layer
  • covers outside of organs in cavity
  • Serous fluid fills the pocket

6
The Serosa
7
Skin Body Membranes, cont
  • Connective tissue membranes
  • Synovial
  • Soft areolar connective tissue
  • NO epithelial cells

8
Functions of I.S.
  • Protects from
  • Mechanical, chemical, bacterial, UV, thermal,
    dessication
  • Heat loss/retention
  • Excretion of urea/uric acid
  • Makes Vitamin D
  • Tells us about external environment

9
Structure
  • Epidermis
  • Stratified squamous
  • Dermis
  • Dense fibrous conn. tissue
  • Hypodermis
  • Adipose tissue

Firmly connected together!
10
Skin Structure
11
Epidermis
  • 5 layers called strata (deep to superficial)
  • stratum basale
  • stratum spinosum
  • stratum granulosum
  • stratum lucidum
  • stratum corneum
  • Avascularno blood supply
  • Keratinocytesproduce keratin

12
Epidermis of Thick Skin
13
A Closer Look at the Strata
  • Stratum basale
  • deepest layer
  • receives nutrients
  • constantly dividing
  • Stratum spinosum
  • Stratum granulosum
  • Cells become flatter, full of keratin
  • Stratum lucidum
  • Cells beginning to die, extra thick, hairless
    skin
  • Stratum corneum
  • DEAD!!!
  • 20-30 cell layers thick

14
Fun Facts
  • Every 25-45 days, you have a completely NEW
    epidermis!
  • Everything you see when you look at someone else
    is DEAD! Gross!

15
Melanin
  • Melanin is a pigment
  • yellow to brown to black
  • Melanocytes make the pigment
  • Freckles/moles
  • Melanin is concentrated in 1 area

16
Dermis
  • Your dermis is your hide
  • Strong, stretchy envelope
  • Dense fibrous conn. tissue
  • Collagen
  • Elastic fibers
  • 2 Regions
  • Papillary layerupper dermis
  • House pain receptors/free nerve endings touch
    receptors (Meissners corpuscles)
  • Reticular layerdeepest skin layer
  • Pressure receptors (Pacinian corpuscles)

17
Dermis, continued
  • Blood Vesselsmaintain homeostasis
  • Rich nerve supply

18
Entry Task 1/8
  • Explain the function of the stratum basale of the
    epidermal layer.
  • Why do we get wrinkled, saggy skin as we age? Be
    sure to identify the layer of skin involved in
    your answer.
  • What part of skin do you think pain receptors are
    found in? Touch receptors?

19
Tuesday 3/25
  • Explore the function of cutaneous receptors
    through a series of lab activities!
  • Review Entry Task
  • Complete Cutaneous Receptors lab activity!
  • HW Read p. 116-124

20
Wednesday 3/26
  • Finish Cutaneous Receptors Activity
  • Activity Make a Sweat Map!
  • PowerPoint covering p.116-124
  • Take notes!!!

21
Skin Color
  • 3 Pigments
  • Melanin
  • Carotene
  • Oxygen-rich hemoglobin
  • Alterations in skin color
  • redness/erythema
  • pallor/blanching
  • jaundice
  • bruises

22
Appendages of the Skin
  • Includes
  • cutaneous glands, hair, hair follicles, and nails
  • Exocrine glandsrelease secretions through ducts
  • 2 Types
  • Sebaceous glands (oil)
  • Sudoriferous glands (sweat)

23
Sebaceous Glands (Oil)
  • All over skin (not on palms/feet)
  • Empties into hair follicles
  • Secretes sebumoil fragmented cells
  • Keeps skin soft
  • Has chemicals that kill bacteria
  • Clogged duct whitehead

24
Sudoriferous Glands (sweat)
  • 2.5 million/person
  • 2 Types Eccrine Apocrine
  • Eccrine
  • More common, produces sweat
  • Heat regulation
  • 7L sweat on a hot day!

25
Sudoriferous Glands, cont
  • Apocrine
  • Mainly in axillary genital area
  • Larger than eccrine glands
  • Secretes fatty acid/protein along with other
    components
  • Bacteria have a hay day!!!

26
Hair Hair Follicles
  • Components
  • Follicle produces hair
  • Shaft part of hair exposed to environment
  • Root part of hair enclosed in the follicle
  • Medulla central core
  • Cortex area between medulla cuticle
  • Cuticle heavily keratinized shingles
  • Arrector pili smooth muscle, connects follicle
    to tissue
  • Matrix growth zone
  • Hair bulb contain melanocytes

27
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28
Nails
  • Components
  • Free edge
  • Body
  • Root embedded in skin
  • Nail folds sides of nails, connected to skin
  • Cuticle thick proximal nail fold
  • Lanula crescent
  • Nail bed extends beneath the nail
  • Nail matrix thick part of nail bed growth

29
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30
Homeostatic Imbalances
  • Over 1000 ailments of the skin!
  • Mostly allergies, fungus, burns, cancer
  • Athletes footfungus
  • Boils/carbunclesinflamed oil glands
  • Cold soresherpes virus
  • Contact dermatitischemical contact
  • Impetigobacterial infection
  • Psoriasisautoimmune disorder

31
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32
Burns
  • Def Tissue damage/cell death caused by
    intense heat
  • Skin thick as a paper towel
  • Almost all body systems suffer when skin is
    burned
  • 2 life threatening problems fluid loss kidney
    shutdown/circulatory shock

33
Burns, cont
  • Rule of Nines
  • Body divided into 11 areas, each covering 9
    surface area
  • Helps determine volume of fluid lost
  • Infection is leading cause of death
  • Burns are sterile 24 hours after
  • Then pathogens invade

34
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35
Burn Classification
  • 1 Burn
  • Epidermis damaged
  • Red, swollen
  • Lasts 2-3 days
  • EX sunburn

36
Burn Classification
  • 2 Burn
  • Epidermis Upper Dermis damaged
  • Red, painful blisters
  • Regrowth can occur
  • No permanent scarring if taken care of

37
Burn Classification
  • 3 Burn
  • Entire thickness of skin destroyed
  • Blanched/Black
  • No painnerves destroyed
  • Regeneration not possible
  • Skin grafting

38
Burn Classification
  • CRITICAL burns meet this criteria
  • 25 of the body has 2 burns
  • 10 has 3 burns
  • 3 burns on the face, hands, and/or feet

39
Skin Cancer
  • Most common of all cancers
  • 1 in 5 people will have skin cancer in their
    lifetime
  • 3 Types
  • Basal cell carcinoma
  • Squamous cell carcinoma
  • Malignant melanoma

40
Basal Cell Carcinoma
  • Least malignant, most common
  • No keratin/boundary formed by stratum basale
  • Invades dermis/hypodermis
  • On face, shiny, slow-growing
  • Full cure _at_ 99 in most cases

41
Squamous Cell Carcinoma
  • Stratum spinosum
  • Scaly, reddened papule
  • Shallow ulcer, raised border
  • Scalp, ears, hands, lips
  • Fast growing
  • If caught early full recovery can be made

42
Malignant Melanoma
  • Cancer of melanocytes
  • 5 cases are melanoma
  • Appears spontaneously, develops from pigmented
    moles
  • brown to black patches
  • 50 survival rate

43
ABCD Rule
  • Asymmetry
  • 2 sides of mole/spot dont match
  • Border irregularity
  • Borders not smooth, have indents
  • Color
  • Different colors, range from black/brown/tan,
    blues/reds
  • Diameter
  • 6 mm

44
Thursday 3/27
Identify different types of burns and skin cancers
  • Finish PowerPoint Notes
  • Begin Review assignment
  • P.127 MC 1-2, 4, 6-7 SA 1-4, 6-11, 13
  • At the Clinic 1-4

45
Friday 3/28
  • Correct Review
  • Play Flyswatter Review game
  • Test over all of CH 4 on Monday after break!

Have a Great Spring Break!
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