Integumentary System Flashcards Preview

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Flashcards in Integumentary System Deck (64):
1

Functions of Integumentary System

Protection
Sensation
Production of Vitamin D
Temperature Regulation
Excretion

2

Two major tissue layers of Sking

Epidermis
Dermis

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type of tissues in Epidermis

squamous epithelium

4

Layers

Stratum basale
Stratum spinosum
Stratum granulosum
Stratum lucidum
Stratum corneum

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other name of Stratum basale

Stratum germinativum

6

duration of cell division in Stratum basale

19 days

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description of Stratum spinosum

8-10 layers of many-sided keratinocytes

8

description of Stratum granulosum

3-5 layers flat keratinocytes

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description of Stratum lucidum

3-5 layers hairless keratinocytes

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description of Stratum corneum

20-30 layers dead keratinocytes

11

Principal Types of Cells in Epidermis

Keratinocytes
Melanocytes
Langerhans
Merkel Cells

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programmed cell death

Apoptosis

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Where does Apoptosis occur

Stratum granulosum

14

duration of journey from stratum basale to corneum

40-56 days

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Keratinocytes account to ____% of Epidermis

90

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Two major Parts of Keratinocytes

Keratin and Lamellar Granules

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Function of Lamellar Granules

h20 Repellant and Sealant

18

Lipid-Rich Granules

Lamellar Granules

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Melanocytes account to ____% of the Epidermis

8

20

Functions of Melanocytes

skin color, protection

21

Langerhans function

immune responses

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formed by red bone marrow, migrates to blood vessels then to epidermis

Langerhans

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Function of Merkel cells

contact with tactile disc of sensory neuron; sensation

24

type of tissue in Dermis

dense connective tissue

25

nerves, hair follicles, smooth muscles, glands and lymphatic vessels extend into the dermis from the hypodermis

dermis

26

2 layers of dermis

Papillary layer
Reticular layer

27

activated Vitamin D

Calcitriol

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function of Calcitriol

to facilitate the absorption of calcium in small intestine

29

deficiency of calcium of bones

osetomalacia

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deficiency of calcium of bones in children

rickets

31

upper dermal region

papillary layer

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fingerlike projections from the upper part of the dermis which extend toward the epidermis

dermal papillae

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deepest skin layer

reticular layer

34

contains blood vessels, sweat and oil glands and deep pressure receptors

reticular layer

35

type of muscle in Arrector Pili

smooth

36

contraction causes the hair to stand up

Arrector Pili muscle

37

Sebaceous glands are found all over the skin except:

soles and palms

38

function of sebum

lubricate hair and skin surface

39

Other name of sweat glands

sudoriferous glands

40

2 types of Sweat glands

eccrine/merocrine
apocrine

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almost ever part of skin especially palms and soles
produce sweat

eccrine

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other name of eccrine

merocrine

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clear secretion mostly water with a few salts

sweat

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produce a thick secretion rich in organic substances

apocrine glands

45

apocrine glands are open to

hair follicles only in axillae and genitalia

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cutaneous glands are influenced by

hormones

47

skin appendages

cutaneous glands,hair, nails

48

nails consist of

layers of dead stratum corneum with hard keratin

49

visible part of nail

nail body

50

acts as a protective shield, shielding the delicate tissues of the underlying nailbed

nail plate

51

found under the nail

nail bed

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part of the nail covered by skin

nail root

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stratum corneum that extends into the nail body; protects matrix

cuticle or eponychium

54

from which the nail root extends distally, responsible for nail growth

nail matrix

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whitish, crescent-shaped area at the base of the nail

lunula

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produced by a hair follicle

hair

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sac-like structure in the skin that surrounds the hair root

hair follicle

58

stratum basale epithelial cells that divide to form hair

hair bulb matrix

59

part of the hair enclosed in the hair follicle

hair root

60

part of the hair projecting from the scalp or skin

hair shaft

61

three layers of the shaft

medulla
cortex
cuticle

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central core of a hair

medulla

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surrounds the medulla

cortex

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outermost layer of cells that surrounds the cortex

cuticle