Question 1

Which layer of the skin is primarily responsible for anchoring the skin to underlying structures such as muscle and bone?

Accepted Answer

Hypodermis (subcutaneous tissue)

Question 2

A patient presents with a deep laceration that has damaged the layer containing dense irregular connective tissue and sensory receptors. Which layer is most likely affected?

Accepted Answer

Dermis

Question 3

Why are topical antibiotics often safe to use on the skin but toxic if swallowed?

Accepted Answer

They are polar molecules and cannot pass through the epidermis to reach blood vessels.

Question 4

Which of the following best explains why the epidermis is avascular?

Accepted Answer

It relies on diffusion of oxygen and nutrients from blood vessels in the deeper dermis.

Question 5

A person develops a 'goosebumps' appearance on their skin when exposed to cold. Which structure is responsible for this response?

Accepted Answer

Arrector pili muscles

Question 6

Which of the following is a function of the skin that contributes to homeostasis by regulating body temperature?

Accepted Answer

Thermoregulation via sweating and cutaneous vasodilation

Question 7

A patient with albinism is at increased risk for keratinocyte DNA damage from UV radiation. What is the underlying cause?

Accepted Answer

Failure to produce melanin due to lack of tyrosinase

Question 8

Which of the following best describes the process by which the skin contributes to vitamin D synthesis?

Accepted Answer

UV radiation converts a modified cholesterol precursor to cholecalciferol in the epidermis, which is then modified by the liver and kidneys.

Question 9

Which type of sweat gland is most prevalent and is responsible for thermoregulatory sweating?

Accepted Answer

Eccrine sweat gland

Question 10

A surgeon wants to minimize scarring when making an incision. According to skin anatomy, which direction should the incision be made relative to tension (cleavage) lines?

Accepted Answer

Parallel to tension lines

Question 11

Which cell type in the epidermis is responsible for detecting light touch and discriminating shapes and textures?

Accepted Answer

Merkel cells

Question 12

Which pigment is responsible for the yellow-orange coloration of the skin and is obtained from dietary sources?

Accepted Answer

Carotene

Question 13

A patient presents with cyanosis. Which of the following best explains the underlying physiological change?

Accepted Answer

Very low levels of bound oxygen in hemoglobin

Question 14

Which of the following statements about thick and thin skin is correct?

Accepted Answer

Thin skin lacks the stratum lucidum and contains numerous hair follicles.

Question 15

Which of the following best describes the life cycle of a keratinocyte in the epidermis?

Accepted Answer

Keratinocytes begin in the stratum basale or spinosum, migrate upward, and are shed from the stratum corneum over 40-50 days.

Question 16

Which gland releases its product by holocrine secretion, resulting in the rupture of the secretory cell?

Accepted Answer

Sebaceous gland

Question 17

A patient with a fever is experiencing erythema. What is the physiological basis for this skin color change?

Accepted Answer

Increased blood flow in the dermis

Question 18

Which of the following equations best represents the negative feedback loop involved in thermoregulation by the skin?

Accepted Answer

$$\Delta T_{body} = T_{set} - T_{current}$$

Question 19

Which of the following is a real-world consequence of excessive exposure to UVA rays, even in tanning salons?

Accepted Answer

UVA rays age skin at a much faster rate and increase risk of skin cancer.

Question 20

Which of the following best explains why nonpolar substances can easily cross the epidermis?

Accepted Answer

Nonpolar substances are not repelled by the lipid-rich environment of the epidermis.

The Integumentary System: Structure and Function

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