Chapter 6:The Integumentary System Flashcards Preview

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Flashcards in Chapter 6:The Integumentary System Deck (100)
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1

What does the integument system consist of?

Skin
Accessory Organs (Hair, Nails, & Cutaneous glands)

2

What are the 3 layers of the skin?

-Epidermis
-Dermis
-Hypodermis

3

What type of tissue is the epidermis made of?

stratified squamous

4

What type of tissue is the dermis made of?

connective tissue

5

Thick Skin (3)

-on palms and soles (corresponding areas)
-has sweat glands, but no hair follicles or sebaceous glands
-has 5 layers

6

Thin Skin (3)

-covers the rest of the body
-has sweat glands, sebaceous glands, & hair follicles
-has 4 layers

7

What are the functions of the skin? (6)

-resistance to trauma & infection
-other barriers (waterproof)
-Vitamin D synthesis
-Sensation
-Thermoregulation
-Nonverbal communication

8

What organs help complete Vitamin D synthesis?

Skin, Liver & Kidneys

9

Characteristics of the epidermis? (3)

-no blood vessels
-depends on the diffusion of nutrients from underlying tissue
-contains dead cells (keratin)

10

What are the layers of the skin?

Stratum corneum
Stratum lucidum
Stratum granulosum
Stratum spinosum
Stratum basale

11

What cells are found in the stratum basale? (4)

keratinocytes
melanocytes
tactile cells
stem cells

12

Where does mitosis take place?

stratum basale & deepest cells of stratum spinosum

13

What happens in the stratum spinosum?

more and more keratin filaments are produced which cause the cells to flatten

14

Characteristics of stratum spinosum? (4)

-dendritic cells found throughout
-named after spiny appearance
-thickest layer in thin skin
-deepest cells capable of mitosis

15

Characteristics of stratum granulosum?

-contains coarse dark staining granules
-waterproofing layer
- 3-5 layers of keratinocytes

16

Characteristics of stratum lucidum? (3)

-seen only in thick skin
-cells have no nucleus or organelles
-thin translucent zone (no granulation)

17

Characterisitcs of stratum corneum? (2)

-30 layers of dead keratinized cells
-resistant to abrasion, penetration, & water loss

18

5 types of cells found in the epidermis

-tactile cells
-melanocytes
-keratinocytes
-dendritic cells
-stem cells

19

Stem cells (2)

-undifferentiated cells that give rise to keratinocytes
-found in stratum basale

20

keratinocytes (2)

-synthesize keratin w/ greatest majority found in epidermal cells
-produced by stem cells

21

melanocytes (3)

-occur only in stratum basale
-synthesize pigment melanin
-branched process spread among keratinocytes

22

tactile (merkel) cells (2)

FEELING
-in basal layer of epidermis
-touch receptors associated w/dermal nerve fibers

23

dendritic cells (3)

-found in stratum spinosum & granulosum
-stand guard against toxins, microbes, etc

24

What does mitosis require?

abundant supply of oxygen & nutrients that are acquired from blood vessels

25

As keratinocytes are pushed up they _________

differientiate

26

Effects on keratinocytes production (2)

-slower in old age
-faster in injury or stressed skin

27

What do the keratinocytes produce?

lipid filled membrane coating vesicles (lamellar granules)

28

What are the 3 important developments that occur in stratum granulosum?

-keratinocytes nucleus & organelles degenerate (cells die)
-granules release a protein filaggrin
-vesicles release lipid mixture that spreads & waterproofs

29

The water barrier is produced by which layers?

stratum granulosum & stratum spinosum

30

Fingerprints come from?

dermis