Question 1

Which layer of the skin is primarily responsible for providing strength and elasticity due to its dense arrangement of collagen and elastic fibers?

Accepted Answer

Reticular region of the dermis

Question 2

A patient presents with a wound that extends into the dermis and subcutaneous layer. Which of the following processes is LEAST likely to occur during the healing of this wound?

Accepted Answer

Contact inhibition stopping cell migration at the wound edge

Question 3

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

Accepted Answer

Langerhans cell

Question 4

Exposure to UV light increases the activity of which enzyme, leading to increased melanin production and tanning?

Accepted Answer

Tyrosinase

Question 5

A surgeon is planning an incision. Why is it important to consider the lines of cleavage in the skin?

Accepted Answer

Incisions across these lines heal more slowly due to disruption of collagen bundles

Question 6

Which layer of the epidermis contains cells filled with eleidin and is only found in thick skin such as the palms and soles?

Accepted Answer

Stratum lucidum

Question 7

A person with albinism lacks which of the following in their skin, hair, and eyes?

Accepted Answer

Tyrosinase activity

Question 8

Which of the following best describes the function of lamellar granules in the stratum granulosum?

Accepted Answer

They secrete a lipid-rich sealant that acts as a water barrier

Question 9

Which formula best represents the relationship between body surface area ($$A$$), rate of insensible perspiration ($$P$$), and total water loss ($$W) $$over time $$t in $$hours?

Accepted Answer

$$W = A 	imes P 	imes t$$

Question 10

A patient develops a dome-shaped lesion filled with white blood cells, dead skin cells, and bacteria. What is the most likely diagnosis?

Accepted Answer

Pustule

Question 11

Which pigment is responsible for the yellow-orange coloration of the skin, especially in individuals who consume large amounts of carrots or egg yolks?

Accepted Answer

Carotene

Question 12

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

Accepted Answer

Production of red blood cells

Question 13

Which type of gland is responsible for producing sebum, and what is its primary function?

Accepted Answer

Sebaceous gland; prevents evaporation from skin and coats hair

Question 14

During the anagen phase of hair growth, which process occurs at the base of the follicle?

Accepted Answer

Matrix cells differentiate, keratinize, and die, leading to hair extension

Question 15

Which structure in the dermis is most directly involved in detecting light touch, textures, and shapes?

Accepted Answer

Meissner corpuscles

Question 16

A patient with vitiligo presents with irregular white spots on their skin. What is the underlying cause?

Accepted Answer

Partial or complete loss of melanocytes due to immune system malfunction

Question 17

Which layer of the epidermis is characterized by large nuclei, many ribosomes, and a cytoskeleton of tonofilaments bound to desmosomes and hemidesmosomes?

Accepted Answer

Stratum basale

Question 18

Which of the following best explains why the nail body appears pink?

Accepted Answer

Underlying capillaries in the dermis

Question 19

Which of the following is a correct sequence of the layers of the epidermis from deep to superficial in thick skin?

Accepted Answer

Stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, stratum corneum

Question 20

Which equation best describes the relationship between the rate of heat loss ($$Q$$), blood vessel diameter ($$d$$), and skin surface area ($$A) in $$the dermis, assuming all other factors are constant?

Accepted Answer

$$Q = k 	imes d 	imes A$$

The Integumentary System: Structure and Function

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