Question 1

Which layer of the skin is primarily responsible for synthesizing vitamin D$$_3$$ when exposed to ultraviolet (UV) radiation?

Accepted Answer

Epidermis

Question 2

A patient presents with a wound that has damaged the reticular layer of the dermis. Which accessory structures are most likely to be affected?

Accepted Answer

Hair follicles and sweat glands

Question 3

Which of the following best explains why the superficial cells of the epidermis die?

Accepted Answer

They are too far from their nutrient source.

Question 4

A burn patient has lost the ability to regulate body temperature through evaporative cooling. Which structure is most likely damaged?

Accepted Answer

Merocrine (eccrine) sweat glands

Question 5

Which layer of the epidermis contains stem cells that are actively mitotic and attached to the basement membrane?

Accepted Answer

Stratum basale

Question 6

A deficiency in vitamin D$$_3$$ during childhood can result in which condition, and what is the underlying physiological problem?

Accepted Answer

Rickets; failure of bone mineralization

Question 7

Which of the following is TRUE regarding melanin production in the skin?

Accepted Answer

Melanin is produced by melanocytes in the stratum basale.

Question 8

During thermoregulation, which physiological response will occur to decrease heat loss from the body?

Accepted Answer

Vasoconstriction of capillaries in the dermal papillae

Question 9

Which type of skin cancer is most likely to metastasize rapidly and is considered the most dangerous?

Accepted Answer

Malignant melanoma

Question 10

A patient complains of loss of fine touch sensation in their fingertips. Which sensory receptor is most likely damaged?

Accepted Answer

Meissner’s (tactile) corpuscle

Question 11

Which of the following glands releases its product directly onto the skin surface and is most important for thermoregulation?

Accepted Answer

Merocrine (eccrine) sweat gland

Question 12

Which layer of the epidermis is only found in thick skin, such as the palms and soles, and consists of densely packed cells filled with keratin?

Accepted Answer

Stratum lucidum

Question 13

A patient has a genetic defect that prevents the formation of desmosomes in the epidermis. Which of the following symptoms would most likely result?

Accepted Answer

Skin cells shed individually rather than in sheets

Question 14

Which of the following best describes the function of sebum produced by sebaceous glands?

Accepted Answer

Inhibits bacterial growth and lubricates hair and skin

Question 15

Which structure in the hair follicle contains epithelial stem cells responsible for hair growth?

Accepted Answer

Matrix

Question 16

A patient with a wound that has formed granulation tissue is in which stage of integumentary repair?

Accepted Answer

Several hours after injury

Question 17

Which of the following is a correct sequence of events during the repair of a superficial skin wound?

Accepted Answer

Scab formation → migration of stratum basale cells → granulation tissue formation → fibroblast activity

Question 18

Which of the following best explains why fingerprints are unique to each individual?

Accepted Answer

Unique patterns of epidermal ridges and dermal papillae

Question 19

Which of the following equations best represents the conversion of vitamin D$$_3 to $$its active form in the body?

Accepted Answer

$$\mathrm{Vitamin\ D_3$\xrightarrow{Liver}\ Intermediate\xrightarrow{Kidney}\ Calcitriol}$$

Question 20

A patient presents with a scar that is raised and extends beyond the original boundaries of the wound. What is this type of scar called?

Accepted Answer

Keloid

The Integumentary System: Structure, Function, and Physiology

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