Q: Which of the following equations best represents the rule of nines for estimating burn area in adults?

$$A_{total} = 9\% \times n_{regions}$$ where $$n_{regions} is $$the number of affected regions$

Question 1

Which layer of the skin is primarily responsible for producing keratin, a protein that provides protection and waterproofing?

Accepted Answer

Keratinocytes in the epidermis

Question 2

A patient presents with a burn that is red, painful, and blisters. Which classification best describes this burn?

Accepted Answer

Second-degree burn

Question 3

Which of the following is NOT a function of the skin barrier?

Accepted Answer

Production of red blood cells

Question 4

Melanin production increases in response to UV exposure. What is the primary function of melanin in the skin?

Accepted Answer

To protect DNA from ultraviolet damage

Question 5

Which gland is responsible for secreting sebum, an oily substance that lubricates and waterproofs the skin?

Accepted Answer

Sebaceous gland

Question 6

A patient has a skin lesion that is asymmetrical, has irregular borders, multiple colors, and a diameter greater than 6 mm. According to the ABCD rule, what is the most likely diagnosis?

Accepted Answer

Malignant melanoma

Question 7

Which layer of the epidermis is the deepest and contains actively dividing cells?

Accepted Answer

Stratum basale

Question 8

Carotene is a pigment that can accumulate in the skin. Where is carotene most likely to be found?

Accepted Answer

Stratum corneum

Question 9

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

Accepted Answer

Produce sweat for thermoregulation

Question 10

A patient with a third-degree burn will most likely experience which of the following symptoms?

Accepted Answer

No pain due to destroyed nerve endings

Question 11

Which of the following equations best represents the rule of nines for estimating burn area in adults?

Accepted Answer

$$A_{total} = 9\% 	imes n_{regions}$$ where $$n_{regions} is $$the number of affected regions$

Question 12

Which cell type in the epidermis is responsible for immune defense?

Accepted Answer

Dendritic (Langerhans) cell

Question 13

A patient is unable to absorb calcium efficiently due to lack of sunlight exposure. Which skin function is most directly affected?

Accepted Answer

Vitamin D synthesis

Question 14

Which layer of the dermis is responsible for fingerprints and contains capillary loops?

Accepted Answer

Papillary dermis

Question 15

Which of the following best explains why apocrine sweat glands begin functioning at puberty?

Accepted Answer

They respond to hormonal changes associated with puberty

Question 16

Which of the following is a correct sequence of layers from the deepest to the most superficial in the epidermis?

Accepted Answer

Stratum basale, stratum spinosum, stratum granulosum, stratum corneum

Question 17

A patient presents with pale skin due to anemia. Which pigment is most likely decreased, causing this appearance?

Accepted Answer

Hemoglobin

Question 18

Which of the following best describes the function of Merkel cells in the epidermis?

Accepted Answer

Sensation of touch

Question 19

A patient with a basal cell carcinoma is most likely to have a tumor originating from which layer?

Accepted Answer

Stratum basale

Question 20

Which of the following is a multi-step process that explains how the skin prevents dehydration?

Accepted Answer

Keratinocytes produce keratin $$\rightarrow$$ keratin accumulates in cells $$\rightarrow$$ forms a waterproof barrier $$\rightarrow$$ reduces water loss

Integumentary System: Structure, Function, and Clinical Relevance

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