Question 1

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

Accepted Answer

It provides a barrier against biological, chemical, and physical assaults by consisting of multiple layers of dead, keratinized cells.

Question 2

A patient presents with silvery white scars on the abdomen after rapid weight gain. What is the most likely cause of these marks?

Accepted Answer

Dermal tears resulting in striae due to extreme stretching of the skin.

Question 3

Which layer of the skin is primarily responsible for shock absorption and insulation?

Accepted Answer

Subcutaneous tissue (hypodermis)

Question 4

A surgeon is planning an incision on a patient’s back. To minimize scarring and promote faster healing, the incision should be made:

Accepted Answer

Parallel to the cleavage (tension) lines of the dermis

Question 5

Which of the following best explains why third-degree burns are often not painful at the site of injury?

Accepted Answer

The burn destroys the entire thickness of the skin, including nerve endings in the dermis.

Question 6

A person with a genetic inability to produce melanin will most likely have which condition?

Accepted Answer

Albinism

Question 7

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

Accepted Answer

Thermoregulation by secreting a watery sweat directly onto the skin surface

Question 8

A patient presents with a bluish tint to their skin and mucous membranes. Which of the following best explains this finding?

Accepted Answer

Low oxygenation of hemoglobin (cyanosis)

Question 9

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

Accepted Answer

They act as macrophages, ingesting foreign substances and activating the immune system.

Question 10

A 30-year-old male develops a rapidly growing, scaly, reddened papule on his lower lip. Biopsy reveals abnormal keratinocytes in the stratum spinosum. What is the most likely diagnosis?

Accepted Answer

Squamous cell carcinoma

Question 11

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

Accepted Answer

Carotene

Question 12

A patient with Addison disease presents with a bronze skin tone. This is most likely due to:

Accepted Answer

Increased melanin production stimulated by ACTH

Question 13

Which of the following is a correct statement about the structure of hair?

Accepted Answer

The cortex consists of several layers of flattened cells surrounding the medulla.

Question 14

A patient is exposed to a chemical that is lipid-soluble. Which skin barrier is most likely to be bypassed, allowing the chemical to enter the body?

Accepted Answer

Physical barrier

Question 15

Which of the following best explains why elderly individuals are more prone to skin infections and cancer?

Accepted Answer

Decreased numbers of melanocytes and dendritic cells in the skin

Question 16

A patient with a third-degree burn over 15% of their body is at greatest immediate risk for which of the following complications?

Accepted Answer

Dehydration and electrolyte imbalance

Question 17

Which of the following best describes the function of the arrector pili muscle?

Accepted Answer

It contracts to cause 'goose bumps' by pulling the hair follicle upright.

Question 18

A newborn presents with thickened, yellow nails. Which of the following is the most likely cause?

Accepted Answer

Fungal infection of the nail

Question 19

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

Accepted Answer

Synthesis of vitamin D for calcium absorption

Question 20

A patient is prescribed a transdermal patch for medication delivery. Which property of the skin allows for the absorption of certain drugs through the skin?

Accepted Answer

Limited penetration of lipid-soluble substances through the physical barrier

The Integumentary System: Structure, Function, and Clinical Aspects

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