Question 1

Which of the following best describes the primary function of melanin in the skin?

Accepted Answer

To protect the apical surface of keratinocyte nuclei from ultraviolet (UV) damage

Question 2

A patient presents with a bluish discoloration of the skin (cyanosis). Which of the following is the most likely physiological cause?

Accepted Answer

Deficiency of oxygen in the circulating blood

Question 3

Which layer of the epidermis is responsible for the continuous production of new keratinocytes through mitosis?

Accepted Answer

Stratum basale

Question 4

A burn patient has lost sensation in the affected area, and the skin appears gray-white. Which degree of burn is most consistent with these findings?

Accepted Answer

Third-degree burn

Question 5

Which of the following glands is primarily responsible for thermoregulation through the production of watery, protein-free sweat?

Accepted Answer

Merocrine (eccrine) glands

Question 6

A person with albinism lacks which of the following?

Accepted Answer

Melanin production due to nonfunctional tyrosinase enzyme

Question 7

Which of the following best explains why the epidermis is avascular?

Accepted Answer

It relies on diffusion of oxygen and nutrients from the underlying dermis

Question 8

A patient presents with a scaly plaque on the hand that has ulcerated and begun to bleed. Biopsy reveals abnormal keratinocytes in the stratum spinosum. What is the most likely diagnosis?

Accepted Answer

Squamous cell carcinoma

Question 9

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

Accepted Answer

To inhibit bacterial growth on the skin surface

Question 10

A person is exposed to sunlight, which stimulates the production of a precursor molecule in the skin. This molecule is then modified by the liver and kidneys to form which vitamin?

Accepted Answer

Vitamin D

Question 11

Which of the following best describes the composition and function of the hypodermis?

Accepted Answer

It is composed mostly of adipose tissue, absorbs shock, insulates, and anchors skin to underlying structures

Question 12

Which of the following best explains why thick skin (such as on the palms and soles) is more resistant to mechanical stress?

Accepted Answer

It has a thicker stratum corneum and contains a stratum lucidum

Question 13

A patient with a burn covering 30% of their body surface area, including the face and hands, is at risk for which of the following complications according to the Rule of Nines?

Accepted Answer

Critical burns due to extent and location

Question 14

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

Accepted Answer

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

Question 15

Which of the following best explains the difference between merocrine (eccrine) and apocrine sweat glands?

Accepted Answer

Merocrine glands are involved in thermoregulation and secrete watery sweat, while apocrine glands secrete thicker, milky sweat and are influenced by sex hormones

Question 16

A patient presents with a mole that is asymmetrical, has an irregular border, multiple colors, and a diameter larger than 6 mm. Which type of skin cancer is most likely?

Accepted Answer

Malignant melanoma

Question 17

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

Accepted Answer

They are macrophages that activate the immune system

Question 18

Which of the following is a correct statement about the structure and function of nails?

Accepted Answer

Nails are derivatives of the stratum corneum and allow for precise manipulation of objects

Question 19

A person with Addison's disease is likely to have which of the following nail changes?

Accepted Answer

Thin and brittle nails

Question 20

Which of the following equations best represents the calculation of the percentage of body surface area affected by burns using the Rule of Nines?

Accepted Answer

$Total\ Burn\ Area\ (\%) = (Number\ of\ affected\ regions) 	imes 9$

The Integumentary System: Structure, Function, and Clinical Relevance

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