Q: Which formula correctly represents the percentage of body surface area affected by burns using the 'Rule of Nines'?

$$Total\ Surface\ Area = 9\% \times Number\ of\ Regions$$

Question 1

Which layer of the epidermis is responsible for the continuous production of new keratinocytes, and what is the typical time for these cells to reach the surface?

Accepted Answer

Stratum basale; 3-6 weeks

Question 2

A patient presents with a burn that affects both the epidermis and the dermis. Which degree of burn does this represent, and what is the primary threat to life from such burns?

Accepted Answer

Second degree; infection

Question 3

Which cell type in the epidermis is responsible for producing melanin, and what is the primary function of melanin?

Accepted Answer

Melanocyte; protection against UV radiation

Question 4

Which layer of the dermis contains capillary loops and sensory receptors, and is responsible for forming fingerprints?

Accepted Answer

Papillary layer

Question 5

A patient is diagnosed with squamous cell carcinoma. Which layer of the epidermis is primarily involved in this cancer, and what is a key characteristic of its progression?

Accepted Answer

Stratum spinosum; rapid growth and can metastasize

Question 6

Which gland is responsible for secreting sebum, and what is its primary function?

Accepted Answer

Sebaceous gland; lubricating and waterproofing hair and skin

Question 7

Which of the following is a function of the integumentary system that involves the synthesis of a vitamin required for calcium absorption?

Accepted Answer

Synthesis of vitamin D

Question 8

A person with jaundice will have a yellowish skin color due to the accumulation of which pigment, and what does this indicate about their health?

Accepted Answer

Bilirubin; liver disorder

Question 9

Which layer of the epidermis is only present in thick skin, such as the palms and soles, and consists of a few rows of clear, flat, dead cells?

Accepted Answer

Stratum lucidum

Question 10

Which of the following best describes the role of Langerhans cells in the epidermis?

Accepted Answer

Act as immune cells to protect against pathogens

Question 11

If a patient has a mutation that impairs the function of keratinocytes, which of the following consequences is most likely?

Accepted Answer

Decreased waterproofing and increased risk of dehydration

Question 12

Which formula correctly represents the percentage of body surface area affected by burns using the 'Rule of Nines'?

Accepted Answer

$$Total\ Surface\ Area = 9\% 	imes Number\ of\ Regions$$

Question 13

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

Accepted Answer

Production of insulin

Question 14

A patient presents with a suspicious mole. According to the ABCDE rule for melanoma, which characteristic is most concerning?

Accepted Answer

Color variation

Question 15

Which layer of the skin contains dense irregular connective tissue and is responsible for the skin's strength and elasticity?

Accepted Answer

Reticular layer

Question 16

Which type of sweat gland is most abundant and plays a major role in thermoregulation?

Accepted Answer

Eccrine sweat gland

Question 17

Which process occurs in the stratum granulosum and is essential for the formation of the skin's protective barrier?

Accepted Answer

Keratinization

Question 18

If the skin loses its ability to dilate dermal capillaries, which function would be most affected?

Accepted Answer

Body temperature regulation

Question 19

Which equation best represents the relationship between skin thickness and the number of cell layers in the stratum corneum?

Accepted Answer

$$Skin\ Thickness \propto Number\ of\ Stratum\ Corneum\ Layers$$

A & P Ch. 5 The Integumentary System and Skin

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