Question 1

Which of the following best explains why the epidermis is avascular and how it receives nutrients?

Accepted Answer

Nutrients diffuse from the dermal blood vessels through the basement membrane to the cells of the epidermis.

Question 2

A patient presents with a burn that is red, painful, and blistered, but does not extend through the entire dermis. According to the classification of burns, which type of burn does this patient most likely have?

Accepted Answer

Second-degree burn

Question 3

Which of the following is a function of the acid mantle produced by the skin?

Accepted Answer

It provides a slightly acidic environment that deters the growth of many pathogens.

Question 4

A person living in northern Europe is more likely to have lighter skin compared to someone living near the equator. Which of the following best explains this adaptation?

Accepted Answer

Lighter skin allows for increased synthesis of vitamin D in regions with less sunlight.

Question 5

Which of the following best describes the process of thermoregulation when body temperature rises above the normal range?

Accepted Answer

Thermoreceptors in the skin detect the increase, the hypothalamus activates the heat-loss center, and blood vessels in the skin dilate while sweat glands increase secretion.

Question 6

Which of the following layers of the epidermis is responsible for the continual production of new keratinocytes?

Accepted Answer

Stratum basale

Question 7

A patient with a genetic lack of melanin is at increased risk for which of the following?

Accepted Answer

Increased risk of keratinocyte DNA damage from UV radiation

Question 8

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

Accepted Answer

Thick skin contains all five epidermal strata and lacks hair follicles, while thin skin lacks the stratum lucidum and contains hair follicles.

Question 9

A patient presents with a bluish discoloration of the lips and nail beds. Which of the following best explains this finding?

Accepted Answer

Decreased oxygen levels in the blood (cyanosis)

Question 10

Which of the following best describes the secretion mechanism of sebaceous glands?

Accepted Answer

Holocrine secretion, where the cell ruptures and releases its contents

Question 11

A patient is diagnosed with basal cell carcinoma. Which of the following statements is most accurate regarding this condition?

Accepted Answer

It arises from keratinocytes in the stratum basale and rarely metastasizes.

Question 12

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

Accepted Answer

The burn destroys nerve endings in the dermis, preventing pain sensation.

Question 13

Which of the following is a correct sequence for the negative feedback loop involved in thermoregulation when body temperature falls below normal?

Accepted Answer

Stimulus → Thermoreceptors in the skin → Heat-promoting center in hypothalamus → Vasoconstriction of skin blood vessels

Question 14

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

Accepted Answer

They act as phagocytes to protect the skin and deeper tissues from pathogens.

Question 15

A person develops a callus on their hand after repeated use of a shovel. Which of the following best explains the formation of this callus?

Accepted Answer

Additional layers of stratum corneum form in response to repeated pressure

Question 16

Which of the following best describes the process of vitamin D synthesis in the skin?

Accepted Answer

A precursor in the deep epidermis is converted to cholecalciferol by UV radiation, then modified by the liver and kidneys to form calcitriol.

Question 17

Which of the following is a distinguishing feature of malignant melanoma compared to other skin cancers?

Accepted Answer

It arises from melanocytes and has a high tendency to metastasize.

Question 18

A patient presents with a yellow-orange discoloration of the skin and the whites of the eyes. Which of the following is the most likely cause?

Accepted Answer

Increased bilirubin in the blood due to breakdown of red blood cells

Question 19

Which of the following best describes the secretion of eccrine sweat glands?

Accepted Answer

They secrete a watery sweat directly onto the skin surface via a duct and pore.

Question 20

A patient with a wound that disrupts the collagen fibers anchoring the epidermis to the dermis is most likely to develop which of the following?

Accepted Answer

A blister

The Integumentary System: Structure, Function, and Clinical Relevance

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