Q: Which equation is used to estimate the percentage of body surface area affected by burns using the rule of nines?

Total burn area (%) = $$\sum \text{Area of each region (as %)}$$

Question 1

Which of the following best describes the function of the hypodermis in the integumentary system?

Accepted Answer

It anchors the skin to underlying tissues and acts as a site for fat storage.

Question 2

A patient presents with cyanosis, which is a bluish discoloration of the skin. What is the most likely physiological cause?

Accepted Answer

Reduced oxygenation of hemoglobin in the blood.

Question 3

Which layer of the epidermis is responsible for the production of new keratinocytes, and what is the primary cell type found there?

Accepted Answer

Stratum basale; keratinocytes

Question 4

A burn that damages the epidermis and the entire dermis, resulting in loss of sensation and white, leathery skin, is classified as:

Accepted Answer

Third-degree burn

Question 5

Which equation is used to estimate the percentage of body surface area affected by burns using the rule of nines?

Accepted Answer

Total burn area (%) = $$\sum 	ext{Area of each region (as %)}$$

Question 6

Which of the following best explains how the skin regulates body temperature?

Accepted Answer

By dilating blood vessels in the dermis to release heat and activating sweat glands for evaporative cooling.

Question 7

Which structure is responsible for producing cholecalciferol (vitamin D3) in the skin, and what is the initial step in its synthesis?

Accepted Answer

Keratinocytes; conversion of 7-dehydrocholesterol by UV radiation

Question 8

Which of the following statements about melanocytes and skin color is correct?

Accepted Answer

All individuals have roughly the same number of melanocytes; skin color differences are due to melanin production and distribution.

Question 9

Which connective tissue type is primarily found in the papillary layer of the dermis?

Accepted Answer

Loose (areolar) connective tissue

Question 10

A patient has a deep cut that follows the direction of tension lines (cleavage lines) in the skin. What is the expected outcome compared to a cut perpendicular to these lines?

Accepted Answer

The wound will heal faster and with less scarring.

Question 11

Which of the following glands releases its secretion directly onto the skin surface and plays a major role in thermoregulation?

Accepted Answer

Eccrine sweat gland

Question 12

Which of the following best describes the composition and function of sebum?

Accepted Answer

A lipid-rich substance that lubricates and waterproofs the skin and hair.

Question 13

Which of the following is a correct match between a skin cancer type and the cell from which it originates?

Accepted Answer

Squamous cell carcinoma; keratinocytes in the stratum spinosum

Question 14

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

Accepted Answer

Thick skin contains all five epidermal layers and lacks hair follicles, while thin skin has fewer layers and contains hair follicles.

Question 15

Which of the following best describes the function of tactile corpuscles?

Accepted Answer

They detect light touch and are found in the papillary layer of the dermis.

Question 16

During the growth phase of hair, which equation best describes the relationship between hair length ($$L$$), growth rate ($$r$$), and time ($$t$$)?

Accepted Answer

$$L = r 	imes t$$

Question 17

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

Accepted Answer

Producing keratin for the epidermis.

Question 18

Which of the following best describes the process by which melanocytes distribute melanin to keratinocytes?

Accepted Answer

Melanocytes package melanin into melanosomes, which are transferred to keratinocytes.

Question 19

Which of the following best explains why the skin is able to excrete waste products?

Accepted Answer

Eccrine sweat glands secrete sweat containing water, salts, and small amounts of metabolic waste.

Question 20

A patient presents with erythema after sun exposure. Which of the following best explains this skin coloration?

Accepted Answer

Increased blood flow to the dermis causes redness.

The Integumentary System: Structure, Function, and Pathology

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