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Flashcards in Integumentary System Deck (34)
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0

What functions does the integumentary system have?

Temp regulation
Synthesis of vitamins
Appearance
Protection
Water conservation
Sensory receptors

1

How many of the 4 tissue types does the integumentary system have?

All 4: epithelial, connective, muscular, and nervous

2

What kind of tissue I the epidermis composed of?

Epithelial tissue

3

What are the tissues the dermis is composed of?

Connective, muscle, nerve

4

What are the most abundant cells in the integumentary system?

Keratinocytes

5

What are the 4 main cells in the skin?

Keratinocytes, melanocytes, langerhans cells, and merkel cells

6

What is the function of keratinocytes?

Water proofing

7

What do melanocytes do?

Produce melanin to protect from sun exposure

8

Langerhans cells work by...

Fighting off infection

9

Merkel cells are...

Sensory cells; Found in deep layers of the dermis

10

Name the 5 layers of epidermal cells

Stratum corneum
Stratum lucidum
Stratum granulosum
Stratum spinosum
Stratum basale

11

Stratum basale (germinativum)

The growing layer of the epidermis; has merkel cells, melanocytes, keratinocytes, and stem cells that divide rapidly.

12

Stratum spinosum

Has spiny projections that bind cells; 8 to 10 cells thick; strong and flexible; take I melanin from near by melanocytes by phagocytosis

13

Stratum granulosum

3-5 layers of flattened keratinocytes undergoing apoptosis (degeneration);
Contain dark staining keratohyalin granules and lamellar granules (waterproofing)

14

Keratinhyalin are found where

Found in keratinocytes of the stratum granulosum layer

15

Stratum lucidum

Thick skin found on the palms and the bottoms of the feet

16

Stratum corneum (horny layer)

25 to thirty layers of flat dead cells filled with keratin and surrounded by lipids; protect from light, water, chemicals, heat, &bacteria

17

What accelerates or regulates the growth of the skin

Epidermal growth factor (EGF); a hormone like protein

18

Melanocytes

Produce the protein melanin when stimulated by UV or MSH (melanin stimulating hormone) which is made during the process of making ACTH
-keratinocytes takin in melanin through phagocytosis

19

When bilirubin builds up in the skin what does this cause and what is it a sign of?

Causes jaundice which is an indicator of liver problems

20

What is the dermis composed of?

-collagen, elastic fibers, fibroblasts, macrophages, and far cells
- contains hair follicle, glands, nerves, blood vessels
- mainly connective tissue

21

What are the two main regions of the dermis

Papillary
Reticular

22

Papillary region

Top portion of the dermis composed of loose connective tissue and elastic fibres
Anchors epidermis to dermis
Contains Meissner's corpuscles (touch)and free beer endings ( pain and temp)

23

Reticular region

Bottom half I the dermis
-dense irregular connective tissue
-interlacing collagen and elastin
- has sweat gland ducts, sebaceous glands, and hair follicle
- provides strength extensibility and elasticity

24

During development some epidermal cells form what 4 structures.

Hair
Nails
Sebaceous glands
Sudiferous glands

25

What does the hair shaft provide

Protection from heat loss (Goose bumps)
Traps things from falling into areas you don't want them in

26

Hair bulb function

Secrete protein and shed cells

27

Hair follicle

Tubular epidermal sheath

28

What muscle move the hair

Ar ( piloerector) rector pili

29

What are the sensory receptors in the skin

Sense touch, pain, temperature, and pressure