Ch. 5

Question 1

epidermis

Answer 1

epithelium of skin

Question 2

dermis

Answer 2

connective tissue of skin

Question 3

hypodermis

Answer 3

connective tissue just underneath skin

Question 4

thick skin

Answer 4

hairless, no sebaceous oil glands

palms of hands, front of fingers, soles of feet, bottom of toes

adaptive for high friction

Question 5

thin skin

Answer 5

hairy, has sebaceous oil glands and sweat glands

covers most of the body

Question 6

functions of skin

Answer 6

resistance to trauma and infection
water retention
synthesis of vitamin D
thermoregulation
nonverbal communication

Question 7

epidermis details

Answer 7

keratinized stratified squamous epithelium
avascular
sparse nerve endings

Question 8

cells of epidermis

Answer 8

keratinocytes, stem cells, melanocytes, tactile (Merkel) cells, dendritic cells

Question 9

keratinocytes

Answer 9

synthesize keratin
vast majority of epidermal cells

Question 10

stem cells

Answer 10

divide and produce keratinocytes
only in stratum basale

Question 11

melanocytes

Answer 11

make melanin
found in stratum basale

Question 12

tactile (merkel) cells

Answer 12

touch receptors that join with nerves
only found in stratum basale

Question 13

dendritic (langerhans) cells

Answer 13

immune surveillance
found in stratum spinous and stratum granulosum

Question 14

layers of epidermis

Answer 14

stratum corneum
stratum lucid
stratum granulosum
stratum spinosum
stratum basale

Question 15

stratum corneum

Answer 15

several layers of dead, scaly cells

Question 16

stratum lucidum

Answer 16

only in thick skin, cells lack organelles

Question 17

stratum granulosum

Answer 17

cells have dark granules

Question 18

stratum spinosum

Answer 18

several layers of cells, often the thickest layer in the epidermis

Question 19

stratum basale

Answer 19

only one cell thick, varied cell types

Question 20

dermis

Answer 20

rich in collagen fibers

large blood supply

cutaneous glands, hair follicles, arrestor muscles, and nail roots

Question 21

layers of dermis

Answer 21

papillary layer
reticular layer

Question 22

papillary layer

Answer 22

superficial, thin

areolar tissue

blood vessels

Question 23

reticular layer

Answer 23

deep, thick

dense irregular connective tissue

striae - stretching of collagen

Question 24

hypodermis

Answer 24

not true layer of skin

below dermis

adipose and areolar tissue

functions:
-energy storage
-thermal insulation
-connection to deeper tissue