A&P Unit 2 (Integumentary System) Flashcards Preview

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Flashcards in A&P Unit 2 (Integumentary System) Deck (45)
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1

Functions of skin...(6)

-absorption
-excretion
-monitoring
-prevention
-protection
-regulation



2

Epidermis (5)

-thinner/outermost layer, rapidly replaced every 2-4 weeks
-stratified squamous epithelial
-lacks blood vessels
-waterproof from keratinization
-4 to 5 layers

3

Layers of the epidermis (5)

outer to inner
-stratum corneum
-stratum lucidum
-stratum granulosum
-stratum spinosum
-stratum basale

4

stratum corneum (2)

-keratinized (waterproof)
-outermost layer

5

stratum lucidum

-only present palms/soles feet

6

stratum basale (3)

-metabolically active (nourished by dermis)
-capable of continued cell division/growth
-contains melanocytes

7

melanocytes (2)

-responsible for skin pigmentation/color
-produce melanin

8

disease: albinism (3)

-absence of pigmentation of skin, hair, eyes
-mutated melanin genes
-melanocytes present but unable to synthesize. tyrosinase

9

disease vitiligo (2)

-autoimmune disease
-antibodies destroy melanocytes leaving white spots

10

keratinization (2)

-keratinocytes pushed to surface, away from blood supply die
-takes 2-4 weeks

11

callus/corn

-constant friction
-abnormal cell grow
-thickening of skin

12

jaundice

-yellowish tone of skin
-accumulation of bilirubin in bood
-indicates liver disease

13

cyanosis

-blood appears deep purplish blue
-inadequate oxygenation of blood

14

how does epithelial tissue protect from ultraviolet light?

-langerhan's cells interact with T-helper cells in activating antibody mediated immune response

15

Dermis functions... (8)

-nourishes overlying tissue
-provides strength, extensibility, elasticity
-regulation of body temperature
-protection
-monitoring of external environment
-excretions
-absorptions
-blood reservoir

16

papillary layer of dermis (3)

-superficial most layer
- 1/5 of total thickness
-loose areolar connective tissue

17

reticular layer of the dermis (2)

-deeper portion
- 4/5 total thickness

18

hairs (pili) (4)

-dead, pigmented, keratinized cells
-arrises from follicle
-1 or more sebaceous glands
-smooth muscle (arrector pili)

19

hair follicle (3)

-tube-like depression of epidermal tissue
-extends into dermis
-external/internal root sheaths

20

root

-portion of hair embedded in follicle (buried)

21

shaft

-portion of hair projecting from skin

22

nails

-plates of tightly packed, clear, keratinized cells

23

lunula (3)

-whitish, thick, semilunar area
-most active growing region
-thickened stratum basale

24

sebacous/oil glands (4)

-associated with hair follicles
-absent soles/palms
-secretes sebum
-prevents hair from drying and becoming brittle

25

sudoriferous / sweat gland: eccrine (2)

-most numerous type
-primary function is cooling body

26

sudoriferous / sweat gland: appocrine (2)

-become active during puberty
-develop scent as bacteria metabolize product

27

merkel cells (2)

-function in sensation/touch
-work in conjunction with tactile/meissner's corpuscles

28

tactile/meissners corpuscles (2)

-function in fine touch
-work in conjunction with merkel cells

29

lamellated/pacinian corpuscles (2)

-sensation of heavy pressure
-large, ellipsoidal structures composed of concentric sheaths

30

What provides sensation of temperature?

Thermoreceptors: hot/cold