Q: Which of the following equations best represents the relationship between heat loss ($$Q$$), surface area ($$A$$), temperature difference ($$\Delta T$$), and thermal conductivity ($$k) in $$skin thermoregulation?

$$Q = k \times A \times \Delta T$$

Question 1

Which layer of the epidermis is responsible for the continuous shedding of dead cells and must be replaced from deeper layers to maintain the integrity of the skin?

Accepted Answer

Stratum corneum

Question 2

A patient presents with a burn that affects both the epidermis and the entire dermis, resulting in loss of sensation and a white, leathery appearance. Which type of burn is this?

Accepted Answer

Third-degree burn

Question 3

Which accessory structure of the skin is responsible for the contraction that causes 'goosebumps'?

Accepted Answer

Arrector pili muscle

Question 4

Which pigment is primarily responsible for the brown coloration of skin and protects against UV radiation?

Accepted Answer

Melanin

Question 5

A patient’s skin appears blue due to low oxygen levels in the blood. What is this condition called?

Accepted Answer

Cyanosis

Question 6

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

Accepted Answer

Blood cell production

Question 7

Which layer of the epidermis contains stem cells that continuously divide to replenish the skin?

Accepted Answer

Stratum basale

Question 8

A person has a mole that is asymmetrical, has irregular borders, and is larger than 6 mm. According to the ABCDE rule, what is the most likely diagnosis?

Accepted Answer

Malignant melanoma

Question 9

Which type of sweat gland is most responsible for body odor due to secretion into hair follicles in the axillary and genital regions?

Accepted Answer

Apocrine sweat gland

Question 10

During thermoregulation, which structure acts as the control center to maintain homeostasis when body temperature rises above normal?

Accepted Answer

Hypothalamus

Question 11

Which of the following best describes the migration of keratinocytes from the deepest layer to the surface of the epidermis?

Accepted Answer

It takes about 40-50 days

Question 12

Which structure in the dermis is responsible for producing fingerprints?

Accepted Answer

Epidermal ridges

Question 13

Which vitamin is synthesized in the skin upon exposure to sunlight?

Accepted Answer

Vitamin D

Question 14

A patient presents with a wound that only affects the epidermis. What is the most likely classification of this wound?

Accepted Answer

First-degree burn

Question 15

Which of the following is a connective tissue layer found deep to the dermis and is also known as the superficial fascia?

Accepted Answer

Hypodermis

Question 16

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

Accepted Answer

Dendritic (Langerhans) cell

Question 17

Which of the following best explains why thick skin is found on the palms and soles?

Accepted Answer

It is subjected to greater mechanical stress

Question 18

Which structure is responsible for the tactile (Meissner) corpuscles found in the dermis?

Accepted Answer

Papillary layer

Question 19

If a person’s skin appears red due to increased blood flow, which term best describes this condition?

Accepted Answer

Erythema

Question 20

Which of the following equations best represents the relationship between heat loss ($$Q$$), surface area ($$A$$), temperature difference ($$\Delta T$$), and thermal conductivity ($$k) in $$skin thermoregulation?

Accepted Answer

$$Q = k 	imes A 	imes \Delta T$$

Integumentary System: Structure, Function, and Pathology

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