5- Integumentary

Question 1

Skin accounts for what percent of body weight

Answer 1

7 %

Question 2

Thickness of skin

Answer 2

1.5 to 4 mm

Question 3

epidermis

Answer 3

superficial region, waterproof

Question 4

dermis

Answer 4

fibrous connective tissue

Question 5

hypodermis

Answer 5

loose areolar connective tissue and adipose tissue

Question 6

Skins functions

Answer 6

1- protection
2- body temp
3- excretion (through sweat)
4- vitamin d (produces)
5- sensory receptors

Question 7

kerationcytes

Answer 7

• produces keratin
• produces antibiotics and enzymes that detoxify harmful chemicals exposed to the skin
• undergo continuous mitosis
• deepest part of epidermis

Question 8

keratin

Answer 8

tough fibrous protein gives epidermis protection properties

Question 9

How often do we have new epidermis?

Answer 9

35-45 days

Question 10

thick skin

Answer 10

• feet and hands

- 5 layers

Question 11

thin skin

Answer 11

• 4 layers

Question 12

strata

Answer 12

bed sheets

Question 13

stratum basale

Answer 13

deepest epidermal layer

single row of cells

Question 14

tactile epithelial cells or merkel cells

Answer 14

distributed among keratinocytes

associated with sensory nerves and receptors for touch

Question 15

melanocytes

Answer 15

10-25% cells in stratum basal
spider-shaped
produce melanin

Question 16

melanin

Answer 16

transfer through spider legs to keratinocytes

creates skin color

Question 17

Dark- skinned people

Answer 17

darker melanin
more granules
more pigment
NOT more melanocytes

Question 18

Light-skinned people

Answer 18

melanin is digested by lysosomes

Question 19

stratum spinosum

Answer 19

mitosis occurs here
thick bundles of intermediate filaments
tension-resisting protein pre-keratin

Question 20

dendritic cells

Answer 20

star-shaped

police outer body surface using endocytosis and take up antigens

Question 21

stratum granulosum

Answer 21

1-5 layers of flattened keratinocytes

granular layer

Question 22

stratum lucidum

Answer 22

in thick skin

transition zone

Question 23

stratum corneum

Answer 23

external part of the epidermis

Question 24

bulla

Answer 24

large blister

Question 25

located between hypodermis and dermis?

Answer 25

dermal plexus

Question 26

located just below the dermal papillae

Answer 26

subpapillary plexus

Question 27

Two layers of the dermis

Answer 27

papillary | reticular

Question 28

papillary layer

Answer 28

superficial 20% of dermis areolar connective tissue contains very thin collagen and elastic fibers

Question 29

dermal papillae

Answer 29

fingerlike projection that extend into the overlying epidermis

Question 30

What create fingerprints and palm prints?

Answer 30

epidermal ridges or friction ridges

Question 31

reticular layer

Answer 31

80% of the thickness of the dermis denser irregular connective tissue thick bundles of collagen and elastic fibers most parallel to the skin surface

Question 32

Less dense regions between collagen bundles

Answer 32

cleavage lines or tension lines

Question 33

Langerham cells

Answer 33

dendritic cells of skin and mucosa

Question 34

strech marks

Answer 34

striae

Question 35

hypodermis is also called

Answer 35

superficial fascia

Question 36

3 pigments that contribute to skin color

Answer 36

1- melanin 2- carotene 3- hemoglobin

Question 37

What are freckles and moles?

Answer 37

localized accumulations of melanin

Question 38

carotene

Answer 38

yellow-orange pigment that body obtains from vegetables accumulates in stratum corneum

Question 39

hematoma

Answer 39

clotted mass of escaped blood

Question 40

skin appendages

Answer 40

``` nails hair hair follicles sebaceous glands sweat glands ```

Question 41

What is the cuticle called?

Answer 41

eponychium

Question 42

Bone of the fingertip

Answer 42

phalanx

Question 43

Hair is filled with what kind of keratin?

Answer 43

Hard keratin

Question 44

Hairs 3 keratinized cell layers

Answer 44

medulla cortex cuticle

Question 45

medulla

Answer 45

large cells and air spaces

Question 46

cortex

Answer 46

several layers of flattened cells

Question 47

cuticle

Answer 47

single layer of cells that overlap one another like a roof

Question 48

Why are tension lines important?`

Answer 48

important to surgeons | incisions made parallel to the lines tend to gape less

Question 49

What do u find in the hypodermis?

Answer 49

superficial fascia

Question 50

What are nails made of?

Answer 50

Dead keratinized cells

Question 51

knot of sensory nerve endings wraps around each hair bulb to form...

Answer 51

hair follicle receptor or root hair plexus

Question 52

a nipplelike bit of the dermis

Answer 52

connective tissue papilla/ hair papilla

Question 53

epithelial cells in the hair bulb just above the papilla makeup

Answer 53

hair matrix

Question 54

wall of hair follicle is

Answer 54

composed of outer connective tissue root sheath

Question 55

epithelial root sheath has two parts

Answer 55

external and internal root sheath