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Chapter 5.1: Integumentary System

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Presentation on theme: "Chapter 5.1: Integumentary System"— Presentation transcript:

1 Chapter 5.1: Integumentary System

2 Functions Cutaneous Membrane—Skin Made up of epidermis and dermis
Accessory Structures Hypodermis—subcutaneous layer

3 Figure 5.1

4 Functions cont… Protection Temperature Maintenance
Synthesis and storage of nutrients Makes Vitamin D Stores Lipids Sensory Reception Touch, Pressure, Pain Excretion and Secretion Excrete salts, water and wastes Secrete milk

5 Epidermis Stratified squamous epithelium
Thick skin—palms and soles of feet 5 layers thick Thin skin—rest of body (4 layers thick) Strata—cell layers

6 Figure 5.1

7 Stratum germinativum Deepest layer Attached to basement membrane
Forms fingerprints Stem cells Divide and grow into new skin Melanocytes—receptors for touch Make melanin Brown, Yellow/brown or black pigment Gives us skin color

8 Figure 5.2

9 Figure 5.3

10 Stratum spinosum Adds to thickness of epidermis

11 Figure 5.2

12 Stratum granulosum Produces keratin Protein
Durable and water resistant Forms hair, calluses and nails

13 Figure 5.2

14 Stratum lucidum Only on palms and soles

15 Figure 5.2

16 Stratum corneum 15-30 layers of dead cells Shed in large groups or sheets

17 Figure 5.2

18 Skin Color Pigmentation Carotene Orange/Yellow pigment
Found in orange veggies Gets converted to vitamin A Keeps epidermis healthy

19 Skin color cont… Melanocytes—produce and store melanin
Increases in sunlight Freckles—small, pigmented spots Greater than average melanin production

20 Figure 5.3

21 UV Rays Good—stimulates synthesis of vitamin D3
Bad—mild to severe burns Melanin absorbs UV rays Protects our DNA Long-term exposure Alterations to connective tissue—wrinkles Chromosomal damage—Skin cancer Prevention—sunscreen with at least SPF 15

22 Figure 5.4

23 Different Skin Color Due to how much melanin is made Ex: Albinism
Have melanocytes Cannot produce melanin

24 Dermal Circulation Blood is red Gives skin reddish tint
Blood vessels dialated—more red color Blood vessels constricted—pale Cyanosis—bluish tint Due to lack of oxygen in blood


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