Q: Which formula would you use to estimate the percentage of body surface area affected by a burn using the 'Rule of Nines'?

$$\text{Burn Percentage} = \frac{\text{Area Burned}}{\text{Total Body Area}} \times 100$$

Question 1

Which layer of the skin is primarily responsible for the synthesis of vitamin D when exposed to UV radiation?

Accepted Answer

Stratum basale

Question 2

A patient presents with a burn that affects the epidermis and part of the dermis, resulting in blistering and pain. According to burn classification, what type of burn does this patient have?

Accepted Answer

Second-degree (partial thickness) burn

Question 3

Which of the following best describes the function of melanocytes in the epidermis?

Accepted Answer

They synthesize melanin to protect keratinocyte DNA from UV damage.

Question 4

During thermoregulation, which physiological response occurs when body temperature rises above the normal range?

Accepted Answer

Stimulation of sweat glands and cutaneous vasodilation

Question 5

Which equation best represents the relationship between heat loss via sweating and body temperature regulation?

Accepted Answer

$$Q = m 	imes L$$

Question 6

A person with a genetic mutation resulting in nonfunctional tyrosinase would most likely exhibit which skin characteristic?

Accepted Answer

Albinism due to lack of melanin production

Question 7

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

Accepted Answer

Regulation of blood glucose levels

Question 8

A patient presents with a blue tint to their skin and low oxygen saturation. Which term best describes this condition?

Accepted Answer

Cyanosis

Question 9

Which type of gland is responsible for producing a protein-rich secretion that becomes odoriferous after bacterial metabolism and is active after puberty?

Accepted Answer

Apocrine sweat gland

Question 10

Which layer of the dermis contains Meissner (tactile) corpuscles and is responsible for providing nutrients to the epidermis?

Accepted Answer

Papillary layer

Question 11

A patient with a large, asymmetrical, multicolored skin lesion with irregular borders and a diameter greater than 6 mm should be evaluated for which condition?

Accepted Answer

Malignant melanoma

Question 12

Which of the following best explains why individuals with darker skin living near the equator have an evolutionary advantage?

Accepted Answer

Darker skin reduces excess vitamin D production and protects against UV-induced DNA damage.

Question 13

Which of the following structures is NOT derived from the epidermis?

Accepted Answer

Arrector pili muscle

Question 14

Which process is responsible for the continuous replacement of keratinocytes in the epidermis?

Accepted Answer

Mitosis in the stratum basale

Question 15

A patient with a wound that extends through the epidermis, dermis, and into the hypodermis is at greatest risk for which complication?

Accepted Answer

Dehydration and infection

Question 16

Which formula would you use to estimate the percentage of body surface area affected by a burn using the 'Rule of Nines'?

Accepted Answer

$$	ext{Burn Percentage} = \frac{	ext{Area Burned}}{	ext{Total Body Area}} 	imes 100$$

Question 17

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

Accepted Answer

Merocrine secretion

Question 18

Which pigment is responsible for the yellow-orange coloration of the skin when consumed in excess?

Accepted Answer

Carotene

Question 19

Which of the following is a plausible consequence of excessive sebum production during adolescence?

Accepted Answer

Development of acne due to blocked sebaceous glands

Question 20

Which cell type in the epidermis acts as an immune cell to protect the skin and deeper tissues from pathogens?

Accepted Answer

Dendritic (Langerhans) cell

The Integumentary System: Structure and Function

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