1. chapter 5-1: integumentary system intro
Essential Question:
Compare and contrast how the Principle of Complementarity (hint: location & function) is different between the types of integument .
Learning Target
Define integument.
Identify the functions of the integumentary system.
Identify the layers of the skin.
Identify the components of the epidermis.
Identify the components of the dermis.
Explain what contributes to skin color.
Define hypodermis.
chapter 5-1: integumentary system intro

2. announcements Chapter 1 Retake (>70%)
Completed stamp sheet assignments
Retake score will be permanent
Class website will be updated today
Refer to stamp sheet for list of assignments
Quiz 1 scheduled for: Friday, 9/17/18
Chapter 5 Test scheduled for: Tuesday, 9/25/18
Last Day to Stamp Chapter 5: Monday, 9/24/18

3. Available Extra Credit
announcements
Available Extra Credit OR
Tissue/Pencil Box = 5 Point Class Pass (Limit 2 per student per chapter)

4. Don’t forget to chunk your notes!

5. Overview: integumentary system
The integumentary system is made up of: skin, hair, nails and glands of the skin.

6. Don’t forget to chunk your notes!

7. Physiology: The Integumentary System (6)
Protection: chemical, physical, and mechanical barrier
Body temperature regulation is accomplished by:
Dilation (widening) of blood vessels- cooling
Constriction (narrowing)- warming
Increasing sweat gland secretions to cool the body
Cutaneous sensation: nerves sense touch and pain

8. Physiology: The Integumentary System (6)
Metabolic functions: makes vitamin D
Blood reservoir: Stores blood
skin blood vessels store up to 5% of the body’s blood volume
Excretion: removes limited amounts of nitrogenous wastes are eliminated in sweat

9. Don’t forget to chunk your notes!

10. Anatomy: Skin (Integument)
Consists of 2 major regions + hypodermis:
Epidermis: outermost superficial region
Dermis: thicker region below epidermis
Hypodermis: (superficial fascia)
Technically not part of the skin but also helps protect the body

11. Don’t forget to chunk your notes!

12. Epidermis
Composed of keratinized stratified squamous epithelium, consisting of four distinct cell types and four layers
Outer portion of the skin is exposed to the external environment and functions in protection
The outer layer is all dead tissue

13. 4 types of Epidermis cells
Keratinocytes: produce the fibrous protein keratin
Melanocytes: produce the brown pigment melanin
Langerhans’ Cells: (white blood cells) that help activate the immune system
Merkel Cells: function as touch receptors in association with sensory nerve endings

14. Don’t forget to chunk your notes!

15. Dermis
The dermis is the 2nd major skin region containing strong, flexible connective tissue
It has blood vessels
Composed of two layers:
papillary + reticular

16. Layers of the Dermis: Layers of the dermis contain:
Connective tissue with collagen and elastic fibers
Collagen fibers in this layer add strength and resiliency to the skin
Elastic fibers provide stretch-recoil properties
Responsible for ridges that increase friction, gripping, and produces our fingerprints

17. Don’t forget to chunk your notes!

18. Hypodermis The hypodermis is a subcutaneous layer deep to the skin
It is composed of adipose & areolar connective tissue
Functions include:
Stores fat
anchors the skin to muscles
acts as a shock absorber
Insulator

19. Don’t forget to chunk your notes!

20. Reticular layer of dermis
Hair shaft
Pore
Dermal papillae
(papillary layer
of dermis)
Epidermis
Meissner's corpuscle
Free nerve ending
Reticular layer of dermis
Sebaceous (oil) gland
Dermis
Arrector pili muscle
Sensory nerve fiber
Eccrine sweat gland
Pacinian corpuscle
Hypodermis
(superficial
fascia)
Artery
Vein
Hair root
Adipose tissue
Hair follicle
Eccrine sweat
gland
Hair follicle receptor
(root hair plexus)
Figure 5.1