Question 1

Which of the following best explains why the stratum corneum is essential for the skin's protective function?

Accepted Answer

It is composed of 20–30 layers of flat, anucleated, keratinized dead cells that act as a barrier against biological, chemical, and physical assaults.

Question 2

A patient presents with a bluish tint to their skin (cyanosis). Which physiological condition is most likely responsible for this appearance?

Accepted Answer

Low oxygenation of hemoglobin in the blood

Question 3

Which of the following is TRUE regarding the papillary layer of the dermis?

Accepted Answer

It contains dermal papillae that house capillary loops, free nerve endings, and tactile corpuscles.

Question 4

A surgeon is planning an incision on a patient’s back. Why is it important to consider the orientation of cleavage (tension) lines in the reticular dermis?

Accepted Answer

Incisions parallel to cleavage lines heal more readily and with less scarring.

Question 5

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

Accepted Answer

They act as macrophages, ingesting foreign substances and activating the immune system.

Question 6

A patient suffers a burn that destroys the entire thickness of the skin, resulting in a gray-white, cherry red, or blackened area with little or no pain. Which type of burn is this, and why is it not painful?

Accepted Answer

Third-degree burn; nerve endings are destroyed, so the area is not painful.

Question 7

Which of the following is a function of eccrine (merocrine) sweat glands?

Accepted Answer

Thermoregulation through secretion of a watery sweat directly onto the skin surface

Question 8

A 35-year-old woman develops coarse, terminal hair on her face and chest. Which underlying condition is most likely responsible for this change?

Accepted Answer

Increased androgen production, possibly due to polycystic ovary syndrome or adrenal tumors

Question 9

Which of the following best explains why the skin is able to act as a blood reservoir?

Accepted Answer

The dermal blood vessels can hold up to 5% of the body’s total blood volume and can constrict to redirect blood to other organs.

Question 10

A patient presents with yellow-tinged skin and sclera (jaundice). Which organ system is most likely compromised?

Accepted Answer

Liver (hepatic) system

Question 11

Which of the following is a correct statement about the process of keratinization in the epidermis?

Accepted Answer

Keratinization begins in the stratum granulosum, where cells accumulate keratohyaline granules.

Question 12

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

Accepted Answer

It is produced by melanocytes and protects keratinocyte DNA from UV damage.

Question 13

A patient is prescribed a transdermal patch for medication delivery. Which property of the skin allows certain drugs to be absorbed through the skin?

Accepted Answer

The ability of lipid-soluble substances to penetrate the stratum corneum

Question 14

Which of the following is a distinguishing feature of thick skin compared to thin skin?

Accepted Answer

Thick skin contains all five epidermal layers, including the stratum lucidum.

Question 15

A patient with severe burns is at immediate risk for which of the following complications?

Accepted Answer

Dehydration and electrolyte imbalance due to loss of the skin’s barrier function

Question 16

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

Accepted Answer

It contracts to cause 'goose bumps' by pulling the hair follicle upright.

Question 17

A patient presents with spoon-shaped nails (koilonychia). Which underlying deficiency should be suspected?

Accepted Answer

Iron deficiency

Question 18

Which of the following is a characteristic of apocrine sweat glands?

Accepted Answer

They secrete a viscous, protein-rich sweat into hair follicles in the axillary and anogenital regions.

Question 19

Which of the following is a metabolic function of the skin?

Accepted Answer

Synthesis of vitamin D needed for calcium absorption in the intestine

Question 20

A patient is diagnosed with melanoma. Which of the following characteristics would most likely be observed using the ABCD rule?

Accepted Answer

A pigmented area with asymmetry, border irregularity, color variation, and diameter greater than 6 mm

The Integumentary System: Structure, Function, and Clinical Aspects

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