1. the Figure Illustrates Keratinization in the Epidermis. What Layer of the Epidermis

chapter 5 quiz 1

Student: ______

1. The figure illustrates keratinization in the epidermis. What layer of the epidermis is "C"?
A. stratum spinosum
B. stratum corneum
C. stratum basale
D. stratum lucidum
E. stratum granulosum

2.The figure illustrates keratinization in the epidermis. What layer of the epidermis is "B"?
A.stratum spinosum
B.stratum corneum
C.stratum basale
D.stratum lucidum
E.stratum granulosum

3.Intact skin provides protection because
A.it forms a physical barrier against the entry of microbes.
B.its secretions keep the skin slightly alkaline.
C.the skin contains components of the excretory system.
D.the skin enhances water loss from the body.
E.macrophages roam in the epidermis.

4.The epidermal layer that is present in the nail bed and the nail matrix is the
A.stratum corneum.
B.stratum lucidum.
C.stratum germinativum.
D.stratum spinosum.
E.stratum lunula.

5.Sweat glands
A.aid in cooling the body.
B.serve as "anchors" for the arrector pili muscles.
C.produce a secretion that oils the hair and skin.
D.produce a secretion that protects the body from growth of bacteria.
E.are not involved in the homeostasis of body temperature.

6.Which of the following statements concerning the epidermis is true?
A.The dermis is superficial to the epidermis.
B.The epidermis contains numerous blood vessels.
C.The most numerous cells in the epidermis are the melanocytes.
D.The epidermis is nourished by blood vessels located in the dermis.
E.The epidermis is very permeable to water-soluble molecules.

7.Parallel curving ridges of dermis that shape the overlying epidermis into fingerprints
A.are associated with thin skin.
B.improve the grip of the hands.
C.decrease friction on surfaces where they are located.
D.are caused by the pattern of the reticular layer of the dermis.
E.tend to make the surface smooth.

8.Keloid scars are raised, thick, and irregular in appearance. A possible cause of keloid scarring is an incision made across the
A.epidermis.
B.stratum spinosum.
C.cleavage lines of the dermis.
D.hypodermis.
E.stratum corneum.

9.Fingerprints and footprints are produced by projections into the epidermis called
A.striae.
B.cleavage lines.
C.reticular lines.
D.melanocytes.
E.papillae.

10.Which vitamin begins its synthesis in the skin exposed to ultraviolet light?
A.vitamin A
B.vitamin B
C.vitamin C
D.vitamin D
E.vitamin E

11.The term "stratum germinativum" is sometimes used to refer to the
A.stratum basale and stratum spinosum.
B.stratum corneum and stratum lucidum.
C.stratum spinosum and stratum granulosum.
D.stratum granulosum and stratum lucidum.
E.stratum basale and stratum corneum.

12.At birth the hairs of the scalp, eyelids, and eyebrows are replaced by coarser pigmented hairs called
A.terminal hairs.
B.primary hairs.
C.lanugo hairs.
D.vellus hairs.
E.pubic hairs.

13.One type of experimental contraceptive device is a skin patch that contains a chemical absorbed through the skin. Which of the following substances might be the type of chemical involved?
A.proteins
B.water-soluble substances
C.lipid-soluble substances
D.carbohydrates
E.amino acids

14.Due to the contraction of smooth muscle in the walls of the dermal blood vessels,
A.the blood vessels become dilated.
B.body heat is conserved.
C.more blood enters into the heart.
D.body temperature tends to drop in that area.
E.more blood flows to the skin.

15.When comparing the dermis with the hypodermis,
A.the dermis has more fat cells than the hypodermis.
B.the dermis is a more vascular tissue than the hypodermis.
C.the dermis is divided into two layers; the hypodermis is not.
D.the dermis contains melanocytes; the hypodermis does not.
E.the dermis and the hypodermis do not contain collagen.

16.Delicate unpigmented hairs that cover the fetus in early development are called
A.terminal hairs.
B.primary hairs.
C.lanugo hairs.
D.vellus hairs.
E.secondary hairs.

17.Stretch marks develop on the abdomen of pregnant women because of stretching and rupture of the
A.dermis.
B.epidermis.
C.melanocytes.
D.stratum corneum.
E.hypodermis.

18.Skin color is the result of
A.the quantity of melanin in the skin.
B.the number of keratinocytes in the skin.
C.the amount of fat in the hypodermis.
D.the thickness of the stratum basale.
E.the number of melanocytes in the skin.

19.The portion of a hair that protrudes above the surface of the skin is the
A.hair bulb.
B.hair root.
C.hair shaft.
D.hair follicle.
E.dermal papilla.

20.The dermis
A.contains no blood vessels.
B.functions as padding and insulation.
C.is divided into three distinct layers.
D.is responsible for most of the skin's structural strength.
E.does not contain connective tissue.