Integumentary System

Question 1

considered as the true covering surface of the body

Answer 1

integument skin

Question 2

largest organ of the vertebrate body

Answer 2

integument skin

Question 3

15-16% of total human body weight

Answer 3

integument skin

Question 4

covers area of 1.6 m^2 (17.5ft)

Answer 4

for average women

Question 5

covers area of 2.0 m^2 (21.5ft)

Answer 5

for average men

Question 6

about 1 to 2 mm thick

Answer 6

skin

Question 7

0.5 mm thick on the _

Answer 7

eyelids

Question 8

6mm thick on the _

Answer 8

palms and soles

Question 9

how many dead skin cells are shed in a lifetime?

Answer 9

40kg (88 lb)

Question 10

how many nerve endings, hairs, muscle, sweat glands, oil glands, blood vessels, heat receptors, cold receptors and pressure-sensing receptors are contained in one sq cm of human skin?

Answer 10

200 nerve endings,
10 hairs and muscles,
100 sweat glands,
15 oil glands, 
3 blood vessels,
12 heat receptors,
2 cold receptors,
25 pressure-sensing receptors

Question 11

7 functions of epidermis

Answer 11

1) covering and protection
2) secretion of substances
3) excretion of metabolic wastes
4) sensation and regulation of temperature
5) storage of reserved food
6) nourishment
7) respiration (in amphibians)

Question 12

thin, upper part of the skin composed of stratified squamous layer of epithelial tissue

Answer 12

epidermis

Question 13

10 to 30 cells thick, about as thick as a page

Answer 13

epidermis

Question 14

outermost layer composed of dead cells packed with keratin

Answer 14

stratum corneum

Question 15

tough, water proof protein

Answer 15

keratin

Question 16

translucent layer, composed of flat dead and non-nucleated cells

Answer 16

stratum lucidum

Question 17

composed of keratohyaline granules

Answer 17

stratum granulosum

Question 18

prickle cell layer, composed of langerhans cells

Answer 18

stratum spinosum

Question 19

inner layer, composed of actively dividing cells

Answer 19

stratum germinativum (basale)

Question 20

90% of epidermal cells, produce keratin

Answer 20

keratinocytes

Question 21

8% of epidermal cells, produce melanin

Answer 21

melanocytes

Question 22

brown pigment, absorbs uv rays

Answer 22

melanin

Question 23

capable of trapping antigen in the skin

Answer 23

langerhans cells

Question 24

make contact with the ending of a sensory neuron

Answer 24

merkel cells

Question 25

largest layer of the skin

Answer 25

dermis

Question 26

lower, thicker part of the skin composed of fibrous connective tissue containing collagen and elastic fibers

Answer 26

dermis

Question 27

contains muscle fibers, glands, pigment cells, blood vessels and sensory nerves

Answer 27

dermis

Question 28

15 to 40 times thicker than thee spidermis

Answer 28

dermis

Question 29

provides structural support for the epidermis and as matrix for many nerve endings, muscles and specialized cells in the skin

Answer 29

dermis

Question 30

consists of areolar connective tissue, forms the dermal papillae, some contains tactile receptors called Meissner's corpuscles

Answer 30

papillary region

Question 31

consists of dense, irregular connective tissue, attached to underlying organs

Answer 31

reticular region

Question 32

for light touch

Answer 32

meissner's corpuscles

Question 33

for deep pressure

Answer 33

pacinian corpuscles

Question 34

for pain and light touch associated with hair follicle

Answer 34

naked nerve endings

Question 35

for heat

Answer 35

corpuscles of ruffini

Question 36

for cold

Answer 36

end bulb of krause

Question 37

composed of fat-rich adipose cells

Answer 37

subcutaneous layer

Question 38

acts as shock absorbers

Answer 38

subcutaneous layer

Question 39

provides insulation to conserve body heat

Answer 39

subcutaneous layer

Question 40

glands originating from the epidermal cells that have invaginated into the dermis

Answer 40

cutaneous or dermal glands

Question 41

true glands, not destroyed during secretion, most sweat glands

Answer 41

merocrine glands

Question 42

part of the cell is destroyed that go with the secretion, mammary gland and some sweat glands

Answer 42

apocrine glands

Question 43

the entire cell goes with the secretion, but a new cell is produced to replace it, sebaceous or oil gland

Answer 43

holocrine glands

Question 44

watery substance, sweat glands

Answer 44

serous glands

Question 45

oily substance called sebum

Answer 45

sebaceous glands

Question 46

substance with mucin

Answer 46

mucous glands

Question 47

non living structures found on the outer layer of the epidermis

Answer 47

keratinized derivatives

Question 48

include the hair of mammals, feathers o birds, nails or claws, beak, scales of reptiles, scutes of turtles and true horns (hollow)

Answer 48

keratinized derivatives

Question 49

non living structures originating in the dermis and found on the outer layer of the epidermis, include the false horns (solid), plates of turtles and scales of fishes

Answer 49

dermal derivatives