Question 1

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

Accepted Answer

Contains stem cells that actively divide to produce new keratinocytes

Question 2

A patient presents with a burn that is red, swollen, and blistered. According to the classification of burns, which layers of the skin are affected?

Accepted Answer

Epidermis and upper dermis

Question 3

Which pigment is responsible for the yellow to orange coloration of the skin, especially visible in the palms and soles, and can be converted to vitamin A?

Accepted Answer

Carotene

Question 4

A surgeon is planning an incision on the trunk. According to the concept of cleavage (tension) lines, what is the best orientation for the incision to promote optimal healing?

Accepted Answer

Parallel to cleavage lines

Question 5

Which of the following is a function of the arrector pili muscle?

Accepted Answer

Contracts to cause 'goose bumps' by pulling hair upright

Question 6

A person with a genetic mutation resulting in nonfunctional tyrosinase would most likely exhibit which of the following symptoms?

Accepted Answer

Lack of melanin production, resulting in albinism

Question 7

Which of the following best explains why third-degree burns are often painless?

Accepted Answer

They destroy nerve endings in the dermis, eliminating sensation

Question 8

Which of the following is NOT a function of sebum produced by sebaceous glands?

Accepted Answer

Regulates body temperature through evaporative cooling

Question 9

A patient presents with bluish discoloration of the skin and mucous membranes. Which of the following best explains this finding?

Accepted Answer

Low oxygenation of hemoglobin (cyanosis)

Question 10

Which of the following structures is responsible for detecting light touch in the skin?

Accepted Answer

Tactile (Meissner's) corpuscle

Question 11

A 35-year-old woman develops coarse, terminal hair on her chin and chest. Which of the following is the most likely underlying cause?

Accepted Answer

Increased androgen production

Question 12

Which of the following best describes the main difference between eccrine and apocrine sweat glands?

Accepted Answer

Eccrine glands are involved in thermoregulation, while apocrine glands are associated with scent and begin functioning at puberty

Question 13

Which of the following is a metabolic function of the skin?

Accepted Answer

Synthesis of vitamin D for calcium absorption

Question 14

A patient with a large, irregular, multicolored mole that has changed in appearance over several months should be evaluated for which type of skin cancer?

Accepted Answer

Melanoma

Question 15

Which of the following best explains why the skin is able to act as a physical barrier to most water and water-soluble substances?

Accepted Answer

Keratinized cells and glycolipids in the stratum corneum

Question 16

A patient with a history of severe sunburns as a child is at increased risk for which of the following conditions later in life?

Accepted Answer

Skin cancer due to DNA damage

Question 17

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

Accepted Answer

Engulf foreign antigens and activate the immune response

Question 18

A patient with a third-degree burn covering 15% of their body, including the face, is at risk for which of the following complications?

Accepted Answer

Critical burn status requiring skin grafting

Question 19

Which of the following is the most likely explanation for the development of stretch marks (striae) on the skin?

Accepted Answer

Extreme stretching of the skin causing dermal tears

Question 20

A patient presents with spoon-shaped nails (koilonychia). Which underlying condition should be considered?

Accepted Answer

Iron deficiency anemia

The Integumentary System: Structure, Function, and Clinical Aspects

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