Question 1

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

Accepted Answer

It provides a tough, water-resistant barrier that protects underlying tissues from abrasion, penetration, and water loss.

Question 2

A patient presents with a burn that is red, swollen, and painful, but blisters are not present. According to the rule of nines, if this burn covers the entire anterior surface of one leg, what percentage of the total body surface area is affected?

Accepted Answer

$$9\%$$

Question 3

Which cell type in the epidermis is primarily responsible for immune defense by presenting antigens to white blood cells?

Accepted Answer

Dendritic (Langerhans) cells

Question 4

A surgeon makes an incision parallel to a cleavage (tension) line in the skin. What is the most likely benefit of this approach?

Accepted Answer

The incision will heal more rapidly and with less scarring.

Question 5

Which of the following best explains why fair-skinned individuals often appear to have a pinkish hue to their skin?

Accepted Answer

Their skin is more transparent, allowing hemoglobin in the blood to show through.

Question 6

A patient with a genetic defect in tyrosinase is likely to have which of the following symptoms?

Accepted Answer

Lack of melanin production, resulting in albinism.

Question 7

Which of the following glands is most directly involved in thermoregulation through evaporative cooling?

Accepted Answer

Eccrine (merocrine) sweat glands

Question 8

A person with a mutation that prevents the formation of lamellar granules in the stratum granulosum would most likely experience which of the following?

Accepted Answer

Increased water loss through the skin due to impaired glycolipid barrier.

Question 9

Which of the following best describes the difference between thick and thin skin?

Accepted Answer

Thick skin contains a stratum lucidum and is found on the palms, fingertips, and soles; thin skin lacks this layer.

Question 10

A patient presents with a rapidly growing, irregularly pigmented skin lesion that has changed in appearance over several months. Which of the following criteria is most concerning for melanoma?

Accepted Answer

Diameter greater than $$6\ \mathrm{mm}$$ and evolving shape

Question 11

Which of the following best explains why apocrine sweat glands are associated with body odor?

Accepted Answer

Their secretions contain proteins and fatty substances that are metabolized by skin bacteria.

Question 12

A person is exposed to poison ivy, which contains lipid-soluble substances. Which skin barrier is most likely to be bypassed by these substances?

Accepted Answer

Physical barrier

Question 13

If a patient has third-degree burns covering the anterior and posterior surfaces of both arms and the anterior surface of the trunk, what percentage of the body is affected according to the rule of nines?

Accepted Answer

$$36\%$$

Question 14

Which of the following is a function of the hypodermis (subcutaneous tissue)?

Accepted Answer

Anchors the skin to underlying structures and provides insulation.

Question 15

A patient with a deficiency in vitamin A would most likely have difficulty with which of the following skin functions?

Accepted Answer

Epidermal cell growth and vision

Question 16

Which of the following best describes the process of keratinization as cells move from the stratum basale to the stratum corneum?

Accepted Answer

Cells accumulate keratin, lose their nuclei and organelles, and eventually die.

Question 17

Which of the following is a correct sequence of the layers of the epidermis from deep to superficial in thick skin?

Accepted Answer

Stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, stratum corneum

Question 18

A person with a blocked sebaceous gland is most likely to develop which of the following conditions?

Accepted Answer

Acne or sebaceous cyst

Question 19

Which of the following best explains why elderly individuals are more prone to overheating in hot weather?

Accepted Answer

Their eccrine sweat gland activity decreases with age, reducing their ability to cool by sweating.

Question 20

A patient with a deep laceration that cuts through the dermis but not the hypodermis will likely damage which of the following structures?

Accepted Answer

Hair follicles and sweat glands

Chapter 5: The Integumentary System – Structure and Function

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