Practice Quiz Q’s For Chapter 5

Question 1

The skin is also known as a (the)________

Answer 1

cutaneous membrane

Question 2

Which type of epithelium makes up the epidermis?

Answer 2

keratinized stratified squamous

Question 3

About 90% of the cells of the epidermis are of which type?

Answer 3

keratinocytes

Question 4

Which layer consists of an average of 25 to 30 layers of flattened dead keratinocytes

Answer 4

stratum corneum

Question 5

The pigment-producing cells of the epidermis are located in which layer?

Answer 5

stratum basale

Question 6

Which of the following is not a correct statement about melanin?
a) granules of melanin are produced and exported by melanocytes
b) melanin granules are the source of skin pigmentation
c) melanin is necessary for production of vitamin D by the skin
d) melanin pigment protects DNA from damaging UV light
e) melanin granules are taken up by keratinocytes

Answer 6

C

Question 7

Which layer has stem cells that undergo cell division to continually produce new keratinocytes?

Answer 7

stratum basale

Question 8

Which epidermal layer marks the transition between metabolically active cells of lower layers and the dead layers of keratinocytes of the upper layers

Answer 8

stratum granulosum

Question 9

This skin layer is only present in places subjected to high levels of mechanical wear-and-tear, and provide an additional protective layer where it occurs, such as in the soles of the feet, palms, and fingertips

Answer 9

stratum lucidum

Question 10

Intraepidermal macrophages are part of the skin’s immune defenses and activate other immune cells when the skin is invaded by microbes. Which layer of the epidermis contains Intraepidermalmacrophages?

Answer 10

stratum spinosum

Question 11

Which statement is not correct about the dermis?
a) it is made up of dense, irregular connective tissue
b) it is thinner in men than in women
c) it contains collagen and elastinfibers
d) it provides the blood supply and many sensory receptors for the epidermis
e) it has a smaller papillary layer, and a thicker reticular layer

Answer 11

B

Question 12

Which of the following would be found in the papillary layer but not the reticular layer of the dermis?

Answer 12

capillary loops

Question 13

Which of the following plays a role in emotional sweating (sweating due to stress or strong emotion, not thermoregulation)?

Answer 13

apocrine glands

Question 14

Thinner hair may be lacking what structural component of a typical hair?

Answer 14

medulla

Question 15

The amount and kind of melanin present in the cortex and medulla of a hair shaft determines hair color. When melanin is replaced by air bubbles in the shaft, which is the resulting hair color?

Answer 15

White

Question 16

The hyponychiumis the __________ of the nail

Answer 16

nail bed

Question 17

Actual growth of the nail occurs in the ________

Answer 17

nail matrix

Question 18

The majority of body hair of _______ is vellus rather than terminal hair

Answer 18

Adult females

Question 19

Along with sweating, which other responses by skin assists with thermoregulation?

Answer 19

blood vessels near the skin can dilate, increasing blood flow and heat loss

Question 20

Which feature(s) of the skin protect(s) us against microbes such as bacteria?
a) the many layers of keratinized cells form a barrier against microbes
b) sebum contains compounds which kill bacteria
c) sweat has an acidic pH which suppresses microbial growth
d) Intraepidermalmacrophages can alert the immune system should microbes invade
e) all of these are correct

Answer 20

E

Question 21

Vitamin D, following activation in the skin, is converted to the hormone calcitriol by enzymes in the liver and kidneys. People in northern climates who may not get adequate sun exposure can become deficient in vitamin D. What mineral would be especially affected by this?

Answer 21

Calcium

Question 22

The skin perceives a variety of sensations from several types of sensory receptors. Which receptor would let a person know if there was a small insect walking across a hair on their arm?

Answer 22

Hair root plexus

Question 23

When an epidermal wound begins the healing process, basal cells migrate away from the basement membrane, enlarge, and migrate to fill in the wounded area). As these cells migrate from different sides of the wound, and reach each other, they stop migrating. This process is called__________

Answer 23

contact inhibition

Question 24

During development in the womb, the fetus by the fifth month is covered and protected by a fatty substance called_________

Answer 24

vernix caseosa

Question 25

In the womb, which is the correct sequence of development for the dermis?

Answer 25

mesoderm→mesenchyme→dermis

Question 26

The skin is composed of both a superficial epidermis and a deeper dermis. The epidermis is highly vascularized, while the dermis is avascular

Answer 26

False

Question 27

The cells of the stratum basalebecome more metabolically active and increase their rate of cell division when upper layers of the epidermis are stripped away due to abrasions or burns

Answer 27

True

Question 28

It takes 4–6 weeks for a keratinocyte to form in the stratum basale, become keratinized in its journey through the upper layers of the epidermis, and to finally be sloughed off as a dead skin cell

Answer 28

True

Question 29

Dermal papillae give rise to a person’s fingerprints and footprints

Answer 29

False

Question 30

A skin graft would be needed if a person damaged the upper layers of the skin down to the stratum granulosum

Answer 30

False

Question 31

Differences in skin pigmentation are due to the number of melanocytes in the basal layer of the skin. People with darker skin have many more melanocytesthan people with paler skin

Answer 31

False

Question 32

Hair follicles go through a characteristic growth cycle: the growth stage, regression stage, and resting stage. At any given time, about 85% of a person’s hair is in the resting stage of the growth cycle

Answer 32

False

Question 33

In addition to a thicker stratum corneumand the presence of a stratum lucidum, the thick skin of the palms and fingertips of the hands and of the soles of the feet have a denser array of sense receptors than thinner skin found elsewhere on the body, and also is hairless

Answer 33

True

Question 34

Water soluble vitamins (B vitamins and vitamin C) can be easily absorbed through the skin, but absorption of the fat-soluble vitamins (vitamin A, D, E and K) is minimal

Answer 34

False

Question 35

In deep wound healing, an injury has penetrated through to the dermis or even the hypodermis (subcutaneous layer). In this type of wound, the healing process will leave a scar and could involve a loss of some functionality of the area of the wound

Answer 35

True

Question 36

Wounds that only damage the epidermis won’t bleed because the epidermis is avascular

Answer 36

True

Question 37

Formation of granulation tissue and a scab would only happen in deep wound healing where the dermis has been damaged

Answer 37

True

Question 38

With advancing age, the dermis thickens and the formation of surface cells of the epidermis speeds up

Answer 38

False