Question 1

Which of the following best describes the primary function of melanocytes in the stratum basale of the epidermis?

Accepted Answer

They synthesize melanin to protect against ultraviolet (UV) radiation.

Question 2

A patient presents with a bluish tint to their skin (cyanosis). Which of the following is the most likely physiological cause?

Accepted Answer

Severe reduction in blood flow or oxygenation of the skin.

Question 3

Which layer of the epidermis is only found in thick skin, such as the palms of the hands and soles of the feet?

Accepted Answer

Stratum Lucidum

Question 4

A surgeon is planning an incision on the skin. To minimize scarring, the incision should be made:

Accepted Answer

Parallel to the cleavage (Langer's) lines.

Question 5

Which of the following best explains why wrinkles form on the skin after prolonged water immersion?

Accepted Answer

Vasoconstriction of superficial blood vessels in the dermis.

Question 6

A burn that damages the entire cutaneous layer (epidermis, dermis, and accessory structures) and requires a skin graft is classified as:

Accepted Answer

Third-degree burn

Question 7

Which of the following statements about the hypodermis (subcutaneous layer) is correct?

Accepted Answer

It stabilizes the position of the skin and contains adipose tissue for energy storage.

Question 8

A 25-year-old male notices thinning hair and a receding hairline. Which of the following best explains the underlying mechanism of androgenic alopecia?

Accepted Answer

A shift from terminal to vellus hair production due to altered androgen levels.

Question 9

Which of the following best describes the function of lamellar granules in the stratum granulosum?

Accepted Answer

They secrete intercellular glycolipids for waterproofing.

Question 10

A patient with a genetic defect in the ABCC11 gene is found to have dry earwax. This is due to:

Accepted Answer

Reduced fat content in cerumen produced by ceruminous glands.

Question 11

Which of the following is a function of the reticular layer of the dermis?

Accepted Answer

Providing strength and elasticity to the skin via collagen and elastic fibers.

Question 12

A person with a deficiency in vitamin D synthesis due to low UV exposure is at increased risk for which of the following?

Accepted Answer

Decreased calcium absorption and bone weakness.

Question 13

Which of the following best explains why the stratum corneum is resistant to water loss but not completely waterproof?

Accepted Answer

Keratinized cells are glued together by keratohyalin and glycolipids, but interstitial fluid can still evaporate.

Question 14

A patient with a large, irregularly shaped, evolving pigmented lesion on the skin is most at risk for which type of skin cancer?

Accepted Answer

Melanoma

Question 15

Which of the following equations best represents the calculation of the percentage of body mass constituted by the integumentary system, given a body mass $$M$$ and skin mass $$S$$?

Accepted Answer

$$ \frac{S}{M} 	imes 100 $$

Question 16

A person with a mutation in the BRAF gene is at increased risk for which of the following skin conditions?

Accepted Answer

Melanoma

Question 17

Which of the following best describes the role of dendritic (Langerhans) cells in the epidermis?

Accepted Answer

They present antigens to T lymphocytes to initiate immune responses.

Question 18

A patient with a deep laceration that crosses the reticular dermis perpendicular to the cleavage lines is most likely to experience:

Accepted Answer

Increased scarring due to severed collagen bundles.

Question 19

Which of the following best explains the difference between vellus and terminal hairs?

Accepted Answer

Vellus hairs lack a central medulla and are fine and unpigmented, while terminal hairs are thick, coarse, and pigmented.

Question 20

Which of the following is a function of eccrine (merocrine) sweat glands?

Accepted Answer

Producing a watery secretion for thermoregulation.

The Integumentary System: Structure, Function, and Components

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