Q: Which of the following equations best represents the percentage of body surface area affected by burns using the Rule of Nines?

$$\text{Total Burn Area} = n \times 9\%$$

Question 1

Which layer of the skin is primarily responsible for the synthesis of vitamin D and the replacement of dead keratinocytes?

Accepted Answer

Stratum basale

Question 2

A patient presents with a burn that is red, painful, and only affects the epidermis. What type of burn is this?

Accepted Answer

First-degree (superficial)

Question 3

Which of the following best explains why the epidermis is limited in thickness?

Accepted Answer

Diffusion of oxygen and nutrients from the dermis is limited by distance.

Question 4

A person living near the equator is likely to have darker skin due to increased melanin production. What is the primary evolutionary advantage of this adaptation?

Accepted Answer

Protection against excess vitamin D synthesis

Question 5

Which structure is NOT considered part of the skin but anchors it to underlying tissues?

Accepted Answer

Hypodermis (superficial fascia)

Question 6

A patient has a scaly plaque on their neck that occasionally bleeds and is diagnosed with squamous cell carcinoma. Which layer of the epidermis did the cancer originate from?

Accepted Answer

Stratum spinosum

Question 7

Which pigment is responsible for the yellow-orange coloration of the skin, especially visible in the stratum corneum of thick skin?

Accepted Answer

Carotene

Question 8

What is the main function of the arrector pili muscle?

Accepted Answer

Contracts to cause hair to stand upright

Question 9

Which type of sweat gland is most prevalent and is responsible for thermoregulation by secreting mostly water and electrolytes?

Accepted Answer

Eccrine gland

Question 10

A patient with albinism is at increased risk for skin cancer. What is the underlying cause of this increased risk?

Accepted Answer

Failure to manufacture tyrosinase, resulting in lack of melanin

Question 11

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

Accepted Answer

Papillary layer

Question 12

A patient presents with pale skin after exposure to cold. What physiological process is most likely responsible for this change?

Accepted Answer

Decreased blood flow in the dermis

Question 13

Which of the following is TRUE regarding the distribution of melanocytes in human skin?

Accepted Answer

The overall number of melanocytes is virtually identical among all individuals.

Question 14

Which of the following best describes the process by which sebum is released from sebaceous glands?

Accepted Answer

Holocrine secretion

Question 15

A patient with cyanosis is likely experiencing which of the following?

Accepted Answer

Low levels of bound oxygen in hemoglobin

Question 16

Which of the following is a function of melanin in the skin?

Accepted Answer

Shields keratinocyte DNA from UV radiation

Question 17

Which of the following equations best represents the percentage of body surface area affected by burns using the Rule of Nines?

Accepted Answer

$$	ext{Total Burn Area} = n 	imes 9\%$$

Question 18

Which of the following is a characteristic feature of malignant melanoma that distinguishes it from other skin cancers?

Accepted Answer

It is identified by the ABCDE rule (Asymmetry, Border, Color, Diameter, Evolving).

Question 19

Which of the following best describes the migration and life cycle of keratinocytes in the epidermis?

Accepted Answer

Keratinocytes begin in the stratum basale or spinosum and migrate to the stratum corneum over 40-50 days.

Question 20

Which of the following is a function of the reticular layer of the dermis?

Accepted Answer

Contains Pacinian corpuscles that respond to pressure and vibration

The Integumentary System: Structure and Function

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