Q: Which equation is used to estimate the percentage of body surface area affected by burns in adults?

The Rule of Nines: $$\text{Total Burn Area} = \sum \text{Area of Each Region}$$, where each region is assigned a percentage.

Question 1

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

Accepted Answer

Melanin protects underlying tissues from ultraviolet (UV) radiation.

Question 2

A patient presents with a bluish coloration of the lips and nail beds. Which physiological process is most likely responsible for this appearance?

Accepted Answer

Sustained reduction of blood flow resulting in decreased oxygen availability (cyanosis).

Question 3

Which layer of the epidermis is responsible for the formation of fingerprints and increased surface area for attachment to the dermis?

Accepted Answer

Stratum basale

Question 4

A third-degree burn is characterized by which of the following?

Accepted Answer

Destruction of epidermis, dermis, and extension into the subcutaneous layer, often with loss of sensation.

Question 5

Which equation is used to estimate the percentage of body surface area affected by burns in adults?

Accepted Answer

The Rule of Nines: $$	ext{Total Burn Area} = \sum 	ext{Area of Each Region}$$, where each region is assigned a percentage.

Question 6

Which of the following best explains why elderly individuals are at increased risk for bone fractures?

Accepted Answer

Decreased production of cholecalciferol in the skin leads to reduced calcitriol, impairing calcium and phosphate absorption.

Question 7

A patient with a mutation causing decreased melanocyte activity is most likely to exhibit which of the following?

Accepted Answer

Albinism, characterized by a lack of melanin and pale skin.

Question 8

Which accessory structure of the skin is primarily responsible for thermoregulation and excretion of wastes?

Accepted Answer

Merocrine (eccrine) sweat glands

Question 9

During the migration phase of skin repair, which process is most critical for preventing infection?

Accepted Answer

Macrophages removing debris and pathogens from the wound site.

Question 10

Which of the following best describes the structural difference between thick and thin skin?

Accepted Answer

Thick skin contains five strata, including the stratum lucidum, while thin skin contains four strata.

Question 11

Which of the following is a plausible consequence of a full-thickness (third-degree) burn covering 60% of the body surface area?

Accepted Answer

Dehydration and electrolyte imbalance leading to circulatory shock.

Question 12

Which of the following best explains the mechanism by which the skin synthesizes vitamin D3?

Accepted Answer

UV radiation converts a steroid in the stratum basale and stratum spinosum to cholecalciferol, which is then processed by the liver and kidneys to form calcitriol.

Question 13

Which of the following is TRUE regarding the structural basis for hair texture and color?

Accepted Answer

Hair texture is influenced by the shape of the hair follicle and the amount of keratin produced.

Question 14

A patient with psoriasis presents with pitted and distorted nails. Which structure is most likely affected?

Accepted Answer

Cells producing nails in the nail root.

Question 15

Which of the following best describes the clinical significance of tension (cleavage) lines in the skin?

Accepted Answer

Cuts parallel to cleavage lines heal better and with less scarring due to the arrangement of collagen and elastic fibers.

Question 16

Which of the following equations best represents the relationship between vitamin D3 synthesis and UV exposure?

Accepted Answer

$$	ext{Cholecalciferol Production} \propto 	ext{UV Exposure}$$

Question 17

Which of the following is a plausible reason why elderly individuals may feel cold even in a warm room?

Accepted Answer

Reduced blood supply to the skin stimulates thermoreceptors, making the person feel cold.

Question 18

Which of the following best describes the process of skin repair after injury?

Accepted Answer

Inflammation phase, migration phase, proliferation phase, and scarring phase, with fibroblasts forming inflexible scar tissue.

Question 19

Which of the following is TRUE regarding the difference between basal cell carcinoma and malignant melanoma?

Accepted Answer

Basal cell carcinoma originates in the stratum basale and rarely metastasizes, while malignant melanoma arises from melanocytes and rapidly metastasizes.

Chapter 5: The Integumentary System – Structure, Function, and Clinical Aspects

Guida di studio - Domande di pratica

Study guide - Flashcard