1. Integumentary System
Chapter 5

2. Lesson 1
Primary structures of the skin

3. Do Now
Read Medical Focus: Body Art and answer questions

4. Structure Cutaneous membrane Adults: 20.83 sq feet
Largest organ in the body
4 types of tissue: epithelial, connective, muscular, nervous
Epidermis = outer
Dermis = inner
Hypodermis = between skin and structures

5. Epidermis Structure 3 layers Outer Thin Epithelial tissue
No blood vessels
Tightly packed cells
Stratum corneum
Stratum lucidum
Stratum basale

6. Stratum Corneum Most superficial Waterproof Keratin (protein)
Protects from water loss/gain
Keratin (protein)
Protects from invaders

7. Stratum Lucidum Protection from friction Found in thick skin
Hands, feet elbows

8. Stratum Basale Deepest layer Produces new cells Uses sensory nerves
Pain receptors send messages to the brain

9. Dermis Inferior to epidermis Dense connective tissue Thick layer
Collagen and elastic fibers
Flexible
Blood vessels
Dermal Papillae: fingerlike tissue which anchors the dermis to the epidermis

10. Hypodermis Below dermis
Between dermis and body structures (bones, tendons, muscles)
Loose connective tissue
Fat
Insulates body
Excess = obesity

11. Content Check
The deepest layer of the epidermis is the ____________________
Blood vessels can be found in:
a) all 3 layers of skin
b) the dermis only
c) the hypodermis and dermis

12. In class assignment Read pg. 92 “I.C.E. – In Case of Emergency”
What is a first responders role in treating burns?
What is the “rule of nines”
What does “ABC” Stand for?
Describe the difference between 1st, 2nd, and 3rd degree burns.
What are the major complications of burns?

13. Homework
Text pg. 96 “Study Questions” # 1-4

14. Lesson 2
Analyzing fingerprints

15. Lesson 3
Accessory structures

16. Do Now Pluck a strand of hair from your own head.
Describe the following:
Color
Texture
Density
Flexibility
Strength

17. Hair Structure of hair Accessory structure Epithelial tissue
Fine and downy except on head
Found on all body parts except: palms, soles, lips, nipples, external reproductive organs
Oil gland
Sebaceous glands
Smooth muscle
Errector pilli allows hair to stand on end

18. Hair Follicles Located in the dermis
Divide rapidly producing new hair cells
As hair is pushed away less nutrients are received
Root = within the follicle
Shaft = beyond the skin

19. Nails Accessory structure Epithelial tissue
Nail root: divides to push out new nail
Cuticle: large amount of cell division
Vascularized creates pink color of unpainted nails

20. Content Check Which part of the hair contains actively growing cells?
a) base of hair follicle
b) hair root
c) hair shaft

21. In class assignment
Forensic worksheet

22. Homework
Text pg. 96 “Study Questions” #5

23. Lesson 4
Hair

24. In class assignment
Analyze hair samples

25. Lesson 5
Glands and Homeostasis

26. Do Now Read pg. 93 Medical Focus “Body Art: Buyer Beware”
What are the risks of tattoos and piercings?
Why do people take that risk?
How permanent is body decoration?

27. Glands Functions Types
Specialized groups of cells that produce and secrete substances into ducts
Sweat glands
Sebaceous glands
Mammary glands

28. Sweat Glands Present in all regions of the skin
Most glands are found in the palms and soles
Why?
Become active when under stress
What is stress? What causes stress?
Use exocytosis to release sweat
What is exocytosis?

29. Apocrine Glands Type of sweat gland Open onto hair follicles
Found in armpits, groin, anus
Become active at puberty
Act as an attractant to the opposite sex

30. Eccrine Glands Type of sweat gland Open to the surface of the skin
Become active when hot
Lower body temperature
EXCRETE salts, urea, water
What is excretion?

31. Sebaceous Glands Associated with hair follicles
Lubricates skin and hair
Makes skin waterproof
Kills bacteria
Secrete oils called sebum
If you don’t release sebum the glands become inflammed and cause acne
How can this be prevented or treated?

32. Mammary Glands Similar to apocrine glands Found in the female breast
Produce milk at childbirth
Can continue to produce milk as long as a child is nursing

33. Aging Cell division (mitosis) decreases Demis becomes thinner
Adipose in hypodermis decreases
What effect might this have on the elderly?
Fewer blood vessels
Hair follicles decrease
Melanocytes decrease
Grey hair
Pale skin
UV radiation causes wrinkles , benign skin growths and skin cancer

34. The Integument and homeostasis
Protection
Regulate water loss
Excretion
Vitamin D
Sensory organ
Body temperature regulation

35. Content Check
Which glands begin secretion at puberty and contain a sex attractant? _________________
Which of the following pathologies causes women to develop excessive body and facial hair?
a) alopecia
b) hirsutism
c) acne vulgaris

36. Homework
Text pg. 96 “Study Questions” #

37. Lesson 6
Skin Cancer

38. Do Now
What causes skin cancer?
Can anyone get skin cancer?

39. In class assignment
Watch a video on skin cancer and answer the worksheet

40. Lesson 7
Review

41. Do Now
Text pg. 96 “Learning Objectives” # 1-5

42. Homework
Text pg. 96 “Learning Objectives” #