Question 1

Which of the following best explains why the epidermis is avascular and how this affects its structure and function?

Accepted Answer

The epidermis is avascular because it is composed of keratinized cells that repel blood vessels, limiting its thickness and requiring diffusion from the dermis for nutrient and oxygen supply.

Question 2

A patient presents with a wound that has destroyed the epidermis, dermis, and part of the hypodermis. Which class of burn does this most likely represent, and what is a major risk associated with this injury?

Accepted Answer

Third-degree burn; risk of dehydration and infection is high due to loss of the protective barrier.

Question 3

Which of the following best describes the process by which the skin helps regulate body temperature when exposed to a hot environment?

Accepted Answer

Cutaneous vasodilation and increased sweat gland activity, leading to heat loss via evaporation.

Question 4

A topical medication is designed to act locally on the skin without entering the bloodstream. Which property should this medication possess to ensure minimal systemic absorption?

Accepted Answer

It should be polar, as polar molecules cannot easily cross the epidermis.

Question 5

Which of the following is the correct order of the epidermal strata from deepest to most superficial in thick skin?

Accepted Answer

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

Question 6

A person living in a region with low UV radiation is more likely to have which adaptation, and why?

Accepted Answer

Lighter skin, to allow sufficient UV penetration for vitamin D synthesis.

Question 7

Which of the following best describes the function of the acid mantle produced by sebaceous glands?

Accepted Answer

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

Question 8

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

Accepted Answer

Decreased oxygenation of hemoglobin (cyanosis).

Question 9

Which of the following structures is responsible for detecting deep pressure and vibration in the skin?

Accepted Answer

Lamellated (Pacinian) corpuscles

Question 10

A surgeon is planning an incision and wants to minimize scarring. According to the concept of tension (cleavage) lines, what is the best approach?

Accepted Answer

Make the incision parallel to tension lines.

Question 11

Which of the following best explains why hair turns gray or white with age?

Accepted Answer

Melanocytes in the hair matrix produce less melanin over time.

Question 12

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

Accepted Answer

It is characterized by asymmetry, irregular borders, and color variation, and has a high tendency to metastasize.

Question 13

Which of the following best describes the role of melanin in the skin?

Accepted Answer

It protects keratinocyte DNA from UV-induced mutations.

Question 14

A patient with albinism is at increased risk for which of the following, and why?

Accepted Answer

Keratinocyte DNA damage from UV radiation, due to lack of melanin.

Question 15

Which of the following best explains why calluses form on the hands and feet?

Accepted Answer

Increased mitotic activity in the stratum basale leads to additional layers of stratum corneum in response to repetitive pressure.

Question 16

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

Accepted Answer

They contract to cause hair to stand up, producing 'goosebumps'.

Question 17

Which of the following is a correct statement about the life cycle of keratinocytes in the epidermis?

Accepted Answer

Keratinocytes are produced in the stratum basale and migrate upward, becoming more keratinized and eventually dying.

Question 18

Which of the following glands is responsible for producing earwax, and what is the function of this secretion?

Accepted Answer

Ceruminous gland; earwax traps particles and lubricates the ear canal.

Question 19

A patient presents with a scaly, ulcerated lesion on the scalp that bleeds easily. Biopsy reveals cancer of keratinocytes in the stratum spinosum. What is the most likely diagnosis?

Accepted Answer

Squamous cell carcinoma

Question 20

Which of the following best explains why sweat is an effective mechanism for cooling the body?

Accepted Answer

Evaporation of sweat from the skin surface removes heat, cooling the body.

The Integumentary System: Structure, Function, and Pathology

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