Question 1

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

Accepted Answer

To shield the nucleus of skin cells from ultraviolet (UV) radiation damage

Question 2

A patient is taking a chemotherapy drug that inhibits cell division. Which layer of the epidermis will be affected first?

Accepted Answer

Stratum basale

Question 3

Which of the following is NOT a function of the hypodermis?

Accepted Answer

Serving as the main site of keratinocyte production

Question 4

A surgeon makes an incision parallel to cleavage (tension) lines in the skin. What is the expected outcome?

Accepted Answer

The incision will heal more readily with less scarring

Question 5

Which of the following pigments is responsible for the yellow to orange coloration most obvious in the palms and soles?

Accepted Answer

Carotene

Question 6

A patient presents with blue-tinged skin (cyanosis). What is the most likely physiological explanation?

Accepted Answer

Low oxygenation of hemoglobin

Question 7

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

Accepted Answer

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

Question 8

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

Accepted Answer

Nerve endings in the affected area are destroyed

Question 9

Which of the following is the most immediate threat to life from a severe burn?

Accepted Answer

Loss of water and electrolytes

Question 10

A patient with a genetic defect in tyrosinase would most likely have which of the following symptoms?

Accepted Answer

Reduced melanin production and lighter skin

Question 11

Which of the following is NOT a function of the skin?

Accepted Answer

Production of red blood cells

Question 12

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

Accepted Answer

They activate the immune system by presenting antigens to white blood cells

Question 13

A person with a mutation that prevents the formation of desmosomes in the epidermis would most likely experience which of the following?

Accepted Answer

Epidermal cells that are not tightly connected, leading to fragile skin prone to blistering

Question 14

Which of the following is a correct statement about eccrine (merocrine) sweat glands?

Accepted Answer

They are primarily responsible for body temperature regulation

Question 15

A patient presents with a yellowish tinge to their skin and eyes. Which of the following is the most likely cause?

Accepted Answer

Liver disorder causing jaundice

Question 16

Which of the following best explains why elderly individuals are more susceptible to hypothermia?

Accepted Answer

Decreased subcutaneous fat and elasticity

Question 17

Which of the following is the most dangerous type of skin cancer due to its high metastatic potential and resistance to chemotherapy?

Accepted Answer

Melanoma

Question 18

A patient has a large, scaly, reddened papule on their scalp that is diagnosed as squamous cell carcinoma. Which cell type is most likely involved?

Accepted Answer

Keratinocytes of the stratum spinosum

Question 19

Which of the following best describes the process of keratinization in the epidermis?

Accepted Answer

Cells accumulate keratin and become flattened as they move toward the surface, eventually dying and forming a protective layer

Question 20

A patient presents with a black-and-blue mark after a fall. What is the physiological basis for this bruise?

Accepted Answer

Clotted blood beneath the skin (hematoma)

The Integumentary System: Structure and Function

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