Question 1

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

Accepted Answer

It provides a durable, water-resistant barrier against abrasion and pathogens.

Question 2

A patient presents with a deep cut on the palm of their hand. Which layer of the skin is most likely to be directly involved in the healing process due to its vascular supply?

Accepted Answer

Dermis

Question 3

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

Accepted Answer

Thick skin is found on the palms and soles and lacks hair follicles.

Question 4

Which cell type in the epidermis is primarily responsible for immune surveillance and alerting the immune system to pathogens?

Accepted Answer

Dendritic (Langerhans) cell

Question 5

A person with a genetic defect that prevents the production of keratin would most likely experience which of the following symptoms?

Accepted Answer

Increased risk of dehydration and infection due to loss of barrier function

Question 6

Which of the following best explains why the skin is able to synthesize vitamin D?

Accepted Answer

Keratinocytes in the stratum basale and spinosum convert 7-dehydrocholesterol to cholecalciferol upon UV exposure.

Question 7

A surgeon plans an incision on the abdomen. To minimize scarring, the incision should be made:

Accepted Answer

Parallel to the cleavage lines of the dermis

Question 8

Which of the following is a function of the hypodermis?

Accepted Answer

Anchoring the skin to underlying tissues and providing insulation

Question 9

A burn patient loses a significant portion of their stratum corneum. Which of the following complications is most likely to occur?

Accepted Answer

Increased risk of dehydration and infection

Question 10

Which of the following best describes the role of melanocytes in the epidermis?

Accepted Answer

They synthesize melanin, which is transferred to keratinocytes to protect DNA from UV radiation.

Question 11

Which of the following layers is responsible for the formation of friction ridges (fingerprints) in thick skin?

Accepted Answer

Dermal papillae and dermal ridges

Question 12

A patient with a mutation causing defective desmosomes in the epidermis would most likely present with:

Accepted Answer

Fragile skin prone to blistering and separation of epidermal layers

Question 13

Which of the following best explains why the palms and soles do not have hair follicles or sebaceous glands?

Accepted Answer

These regions are covered by thick skin, which lacks hair follicles and sebaceous glands.

Question 14

Which of the following is TRUE regarding the papillary layer of the dermis?

Accepted Answer

It contains dermal papillae that increase surface area for exchange with the epidermis.

Question 15

A person with a deficiency in dermcidin and defensins would most likely experience which of the following?

Accepted Answer

Increased susceptibility to skin infections due to reduced antimicrobial barrier

Question 16

Which of the following best describes the difference in melanin production between individuals with different skin colors?

Accepted Answer

Individuals with darker skin produce more melanin and distribute it more widely in keratinocytes.

Question 17

Which of the following is a real-life application of the barrier function of the skin?

Accepted Answer

Transdermal drug delivery systems utilize the skin's ability to absorb certain chemicals.

Question 18

Which of the following best explains why the hypodermis is a preferred site for subcutaneous injections?

Accepted Answer

It contains large blood vessels and loose connective tissue, allowing for rapid absorption of injected substances.

Question 19

A patient presents with a localized area of increased melanin in the skin, but no increase in the number of melanocytes. This is most likely a:

Accepted Answer

Freckle

Question 20

Which of the following equations best represents the relationship between the area of skin ($$A$$), body weight ($$W$$), and the percentage of body weight that is skin ($$P$$)? Assume $$P = 0.15 (15$$%).

Accepted Answer

$$P = \frac{W_{skin}}{W_{total}}$$

The Integumentary System: Structure, Function, and Clinical Relevance

Guida di studio - Domande di pratica

Study guide - Flashcard