Chpater 5 PLQs

I

which structures are dermal papillae?

C. Sebaceous glands

During embryonic development, which of the following accessory structures of the skin develops as an outgrowth of epithelial cells from the sides of a hair follicle? A. Eccrine sweat glands B. Apocrine sweat glands C. Sebaceous glands D. Fingernails E. Arrector pili muscles

E

Which letter is pointing to the subcutaneous layer of the skin in the figure?

C. UV radiation stimulates increased production of melanin by melanosomes.

Which of the following best describes events that lead to the tanning of skin that occurs after exposure of the skin to the sun's UV radiation? A. UV radiation stimulates increased numbers of melanocytes in the skin. B. UV radiation stimulates increased numbers of keratinocytes in the skin. C. UV radiation stimulates increased production of melanin by melanosomes. D. UV radiation inactivates tyrosinase activity in melanocytes. E. UV radiation stimulates increased production of carotenes by keratinocytes.

blood clot is forming

Which of the following best describes the events occurring at point A in the diagram of deep wound healing shown below?

Epithelium is migrating across wound.

Which of the following best describes the events occurring at point B in the diagram of deep wound healing shown below?.

E. Melatonin

Which of the following chemicals does NOT contribute to the color of human skin? A. Carotene B. Hemoglobin C. Pheomelanin D. Eumelanin E. Melatonin

A. Hirsutism

Which of the following conditions is characterized by excessive body hair caused by tumors in adrenal glands, testes or ovaries? A. Hirsutism B. Pallor C. Jaundice D. Androgenic alopecia E. erythema

D. Presence of sebaceous glands.

Which of the following is a common characteristic of thin skin? A. Hairless. B. Contains a stratum lucidum. C. High density of sensory receptors. D. Presence of sebaceous glands. E. Contains epidermal ridges

B. Acne

Which of the following skin disorders involves inflammation of sebaceous glands caused by bacteria which thrive in the lipid-rich sebum? A. Alopecia B. Acne C. Vitiligo D. Pressure ulcer E. Eczema

D

The couruscle of touch (Meissner's corpuscle would be found in which layer of the skin shown in the figure?

G

Which structure is an eccrine sweat gland?

A

Which structures in the figure are sensitive to warmth, coolness and itching?

corneum, lucidum, granulosom, spinosum, basale

You stepped on a nail. List the sequential layers (or strata) of the epidermis that the nail penetrated through to finally reach the dermis.

C

In the figure of a sagittal section of a fingernail shown, where is the lunula?

B

In the photomicrograph of a portion of thick skin shown below, which layer is only seen in thick skin?

E

In the photomicrograph of a portion of thick skin shown below, which layer is the stratum basale?

D

In the photomicrograph of a portion of thick skin shown below, which layer is the stratum spinosum?

Keloid scar

In this type of scar, the scar tissue extends beyond the boundary of the injury into normal tissue.

is a protein

Keratin is a?

The stratum lucidum...

is present only in thick skin.

contraction of arrector pili muscles.

"Goose bumps" are caused by...

melanin

Albinism is the inherited inability to produce...

E. All of these choices are correct.

Characteristics of thick skin include: A. Found in the palms, soles of the feet and fingertips. B. Does not contain hair follicles. C. Contains more sweat glands than thin skin. D. Contain epidermal ridges. E. All of these choices are correct.

stratum corneum

Constant exposure of skin to friction stimulates the formation of a callus, which is the thickening of the ________ of the epidermis.

B

In the diagram of a hair root shown, where is the cortex?

C

In the diagram of a hair root shown, where is the cuticle of the hair?

F

In the diagram of a hair root shown, where is the dermal root sheath?In the diagram of a hair root shown, where is the dermal root sheath?

F

In the diagram of skin shown below, where is the apocrine sweat gland?

D

In the diagram of skin shown below, where is the arrector pili muscle?

H

In the diagram of skin shown below, where is the reticular region of the dermis?

C

In the diagram of skin shown below, where is the sebaceous gland?

A

In the diagram of skin shown below, which labeled structure generates fingerprints?

F

In the diagram, which is a melanocyte?

C

In the diagram, which is the external root sheath?

G

In the diagram, which is the hair matrix?

B

In the diagram, which is the internal root sheath?

E

In the diagram, which is the papilla of the hair?

I

In the diagram, which layer is the stratum corneum?

G

In the diagram, which layer is the stratum granulosum?

G

In the diagram, which structure is directly destroyed by electrolysis?

E

In the figure of a sagittal section of a fingernail shown below, where is the nail matrix?

A

In the figure of a sagittal section of a fingernail shown below, where is the nail root?

B

In the figure of a sagittal section of a fingernail shown, where is the eponychium (cuticle)?

G

In the figure of a sagittal section of a fingernail shown, where is the hyponychium (nail bed)?

assist hair in touch perception.

The hair root plexus functions to...

cells accumulating a tough fibrous protein that helps protect the skin.

The process of keratinization involves...

Intraepidermal macrophages (Langerhans cells)

This epidermal cell has a role in immunity and disease resistance.

Sebum

This is a mixture of triglycerides, cholesterol, proteins and inorganic salts.

Hypodermis

This is another name for the subcutaneous layer.

Lanugo

This is fine nonpigmented hair that covers the body of the fetus.

Stratum basale

This layer of epidermis is composed of a single row of cuboidal or columnar keratinocytes

Stratum granulosum

This layer of the epidermis contains layers of flattened keratinocytes that are going through apoptosis.

Dermis

This layer of the skin is composed mainly of dense irregular connective tissue containing collagen and elastic fibers.

Epidermis

This layer of the skin is composed of a keratinized stratified squamous epithelium.

Melanin

This pigment secreted by specialized cells in the skin is capable of absorbing ultraviolet light.

Sebaceous gland

This type of exocrine gland is a simple, branched acinar gland connected to a hair follicle.

Eccrine sweat gland

This type of exocrine gland is a simple, coiled tubular gland that is found throughout almost the entirety of the skin.

Jaundice

Which condition is due to a buildup of bilirubin pigment in the skin?

D. Male-pattern baldness

Which condition results from androgens inhibiting hair growth in genetically predisposed adults? A. Hirsutism B. Pallor C. Jaundice D. Male-pattern baldness E. Erythema

E. Oil glands

Which of the following structures found in the skin help prevent water loss and inhibit bacterial growth on the surface of the skin? A. Arrector pili B. Lunula C. Sweat glands D. Hair follicles E. Oil glands

C. Sweat glands

Which of the following structures found in the skin plays an important role in thermoregulation? A. Merkel cells B. Sebaceous glands C. Sweat glands D. Nails E. Fingerprints

corneum, lucidum, granulosom, spinosum, basale

Which of the following term refers is NOT a hemoestatic contribution of skin?

A. Callus

Which of the following terms refers to a Hardened and thickened area of skin resulting from persistent pressure and friction? A. Callus B. Blister C. Wart D. Papule E. Fever blister

E. Eczema

Which of the following terms refers to an inflammation of the skin characterized by patches of redness, blistering, and extreme itching? A. Papule B. Laceration C. Keratosis D. Frostbite E. Eczema

D. Laceration

Which of the following terms refers to an irregular tear of the skin? A. Abrasion B. Papule C. Keloid D. Laceration E. Cyst

B. Pallor

Which of the following terms refers to paleness of the skin such as seen in patients with shock or anemia? A. Hirsutism B. Pallor C. Jaundice D. Androgenic alopecia E. Erythema

E. Erythema

Which of the following terms refers to persistent redness of the skin such as seen in patients with inflammation, infection or heat exposure? A. Hirsutism B. Pallor C. Jaundice D. Androgenic alopecia E. Erythema

B. Hives

Which of the following terms refers to reddened, elevated, and itchy patches of skin commonly caused by emotional stress, physical trauma, or certain food allergies? A. Wart B. Hives C. Papule D. Cyst E. Eczema

Both E & F

Which of the labeled cells in the diagram of deep wound healing shown below has phagocytic properties?

B. Ectoderm

Which of the primary germ layers of the embryo does the epidermis of the skin develop from? A. Endoderm B. Ectoderm C. Mesoderm D. All of these choices are correct. E. Both endoderm and ectoderm

C

Which structure in the figure detects touch sensations?

F

Which structure in the figure is a receptor sensitive to pressure?

D

Which structure in the figure produces a pigment that contributes to skin color and absorbs UV radiation?

A

Which structure in the figure produces a protein that helps protect the skin and underlying tissues from heat, microbes and chemicals?