Question 1

Which of the following best describes the main function of the stratum corneum in the epidermis?

Accepted Answer

It provides a barrier against biological, chemical, and physical assaults by forming layers of dead, keratinized cells.

Question 2

A patient presents with a yellowish discoloration of the skin and sclera. Which pigment is most likely responsible for this condition, and what is the underlying cause?

Accepted Answer

Bilirubin; liver dysfunction leading to jaundice

Question 3

Which of the following statements about the dermal papillae is correct?

Accepted Answer

They contain capillary loops that supply nutrients and oxygen to the lower layers of the epidermis.

Question 4

A surgeon is planning an incision on a patient’s back. According to the concept of cleavage (tension) lines in the dermis, which of the following is the best approach to minimize scarring?

Accepted Answer

Make the incision parallel to the cleavage lines.

Question 5

Which of the following best explains why third-degree burns are considered critical if they cover more than 10% of the body surface area?

Accepted Answer

They result in the loss of fluids containing proteins and electrolytes, leading to dehydration and electrolyte imbalance.

Question 6

Which of the following cell types in the epidermis is primarily responsible for immune defense by acting as a phagocyte and antigen-presenting cell?

Accepted Answer

Dendritic (Langerhans) cell

Question 7

A person with a genetic mutation that reduces the production of dermcidin would most likely experience which of the following?

Accepted Answer

Increased risk of bacterial infections on the skin

Question 8

Which of the following best describes the secretion of eccrine sweat glands?

Accepted Answer

A hypotonic solution of 99% water, salts, dermcidin, and metabolic wastes

Question 9

Which of the following is a function of the hypodermis?

Accepted Answer

It anchors the skin to underlying structures and insulates the body.

Question 10

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

Accepted Answer

Poorly oxygenated hemoglobin in the blood (cyanosis)

Question 11

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

Accepted Answer

It involves the accumulation of keratohyaline granules and the flattening of cells as they move toward the surface.

Question 12

Which of the following is NOT a function of the integumentary system?

Accepted Answer

Production of red blood cells

Question 13

A patient with a large, irregularly shaped, multicolored mole that is evolving in size should be evaluated for which condition, using which diagnostic rule?

Accepted Answer

Melanoma; ABCDE rule

Question 14

Which of the following best explains why sweat produced by eccrine glands is important for thermoregulation?

Accepted Answer

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

Question 15

Which of the following is true regarding the distribution and function of sebaceous (oil) glands?

Accepted Answer

They secrete sebum into hair follicles, lubricating and waterproofing the skin.

Question 16

A patient with a genetic disorder affecting the formation of desmosomes would most likely experience which of the following symptoms?

Accepted Answer

Fragile skin that blisters easily due to loss of cell-to-cell adhesion

Question 17

Which of the following best describes the difference between vellus and terminal hair?

Accepted Answer

Vellus hair is pale and fine, while terminal hair is coarse and appears in axillary and pubic regions at puberty.

Question 18

Which of the following is a correct statement about the papillary and reticular layers of the dermis?

Accepted Answer

The reticular layer contains elastic and collagen fibers that provide strength, resiliency, and stretch-recoil properties.

Question 19

A patient with a burn covering the entire anterior and posterior surfaces of both legs and the anterior trunk would have what percentage of body surface area burned, according to the Rule of Nines?

Accepted Answer

$$49\%$$

The Integumentary System: Structure, Function, and Clinical Relevance

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