ch. 5, 6, 7, 8, 9 Flashcards Preview

anatomy and physiology > ch. 5, 6, 7, 8, 9 > Flashcards

Flashcards in ch. 5, 6, 7, 8, 9 Deck (222)
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1

2 major components of the integumentary system

cutaneous membrane
accessory structures

2

epidermis and dermis (and hypodermis)

cutaneous membrane

3

hair, nails, sebaceous glands and sweat glands

accessory structures

4

protect of underlying tissues and organs
excrete salts, h2o, and organic wastes by glands
help maintain body temp
produce melanin
product keratin
make vitamin D
store lipids
detect touch, pressure, pain and temp

fx of skin

5

what type of tissue makes up the epidermis

stratified squamous epith

6

what is the vascularity of the epidermis

avascular- but deepest cells rely on diffusion of nutrients and o2 from capillaries within dermis

7

4 layers of the epidermis

stratum corneum
stratum granulosum
stratum spinosum
stratum basale

8

on top
15-30 layers of cells
dead cells and are easily rubbed away

stratum corneum

9

3-5 layers of cells - thinner and flatter with keratin

stratum granulosum

10

thick layer (8-10 layers of cells)

stratum spinosum

11

what is stratum basale also known as

germinativum

12

deepest layer- next to basement membrane
tightly bound to dermis
much mitosis here via stem cells

stratum basale

13

what skin has 5 layers of skin

stratum granulosum

14

how long do skin cells live

7-10 days

15

how long does skin take to move through its life cycle

dead cells stay in stratum corner for additional 2 weeks before they are shed or washed away

16

tough fibrous proteins

keratin

17

where is keratin found

within stratum granulosum

18

basic structural component of hair and nails

keratin

19

where is keratin made

stratum corner cells are keratinized-have protective, hardened, superficial layer of cells filled w keratin (water resistant)

20

another word for keratinized

cornified

21

2 pigments naturally found in the epidermis

carotene
melanin

22

yellow orange pigment found in orange vegetables
can accumulate in epidermal cells and hypodermic

carotene

23

what color is melanin

brown, yellow-brown, or black pigment

24

what cells produce melanin

melanocytes in stratum basale

25

melanosomes and these travel up epidermis

package it in vesicles

26

pale skin?

melanosomes don't travel very far up

27

darker skin?

melanosomes are larger and travel farther up

28

what is the difference in skin pigmentation

no difference in number of melanocytes just depends on levels of how much melanin is made

29

fx. protect deeper cells from UV radiation; melanocytes increase their activity in response to UV exposure

melanin

30

how does the fx of melanin relate to tanning

melanin protects us from UV rays until it can no longer protect us, causing us to burn