Question 1

Which layer of the skin is primarily responsible for providing a durable but flexible surface that resists mechanical trauma, and what type of cells make up this layer?

Accepted Answer

The epidermis; composed of keratinized stratified squamous epithelial cells

Question 2

A patient presents with a blister after repetitive trauma to the skin. Which specific structure is disrupted, leading to the formation of a fluid-filled pocket?

Accepted Answer

Collagen fibers at the dermis-epidermis junction

Question 3

Which of the following best describes the process by which the skin regulates body temperature when exposed to high environmental heat?

Accepted Answer

Dilation of blood vessels and increased sweating

Question 4

A topical medication is safe to apply to the skin but toxic if swallowed. What property of the medication allows it to be used this way?

Accepted Answer

It is polar and cannot pass through the epidermis to reach blood vessels

Question 5

Which layer of the epidermis is only found in thick skin, such as the palms and soles, and what is its primary characteristic?

Accepted Answer

Stratum lucidum; narrow, clear layer of dead keratinocytes

Question 6

Which cell type in the epidermis acts as a sensory receptor for light touch and is most numerous in the fingertips and lips?

Accepted Answer

Merkel (tactile) cells

Question 7

A patient with albinism is at increased risk for DNA damage in keratinocytes. What is the underlying cause of this increased risk?

Accepted Answer

Failure of melanocytes to manufacture tyrosinase, resulting in lack of melanin

Question 8

Which pigment is responsible for the yellow-orange coloration of the skin, especially visible in thick skin, and where is it primarily accumulated?

Accepted Answer

Carotene; accumulated in the stratum corneum

Question 9

A patient presents with a bluish discoloration of the lips and nail beds. Which condition is most likely responsible for this finding?

Accepted Answer

Cyanosis

Question 10

Which type of sweat gland is most prevalent in the skin, releases its product by merocrine secretion, and plays a primary role in thermoregulation?

Accepted Answer

Eccrine sweat gland

Question 11

A patient suffers a third-degree burn covering the entire right lower limb. Using the Rule of Nines, what percentage of the body surface area is affected?

Accepted Answer

$18\%$

Question 12

Which skin cancer arises from keratinocytes in the stratum basale, is the most common overall, and rarely metastasizes?

Accepted Answer

Basal cell carcinoma

Question 13

Which of the following is a function of sebum produced by sebaceous glands?

Accepted Answer

Adds a hydrophobic barrier to the skin and hair

Question 14

Which structure in the dermis is responsible for responding to deep pressure and vibration?

Accepted Answer

Lamellated (Pacinian) corpuscles

Question 15

Which process describes the elimination of small amounts of metabolic waste products, such as lactic acid and urea, through the skin?

Accepted Answer

Excretion

Question 16

A patient develops a mole (nevus) on their skin. What is the underlying cause of this pigmentation change?

Accepted Answer

Local proliferation of melanocytes

Question 17

Which layer of the skin is NOT considered part of the skin but is highly vascularized and contains loose connective and adipose tissue?

Accepted Answer

Hypodermis (superficial fascia/subcutaneous tissue)

Question 18

Which of the following best explains why individuals living near the equator tend to have darker skin?

Accepted Answer

To prevent excess vitamin D production due to high UV exposure

Question 19

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 20

A patient presents with a scaly plaque on the head that bleeds and ulcerates. Which skin cancer is most likely, and what is its origin?

Accepted Answer

Squamous cell carcinoma; arises from keratinocytes in the stratum spinosum

The Integumentary System: Structure and Function

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