Q: Which equation best represents the conversion of cholecalciferol to calcitriol, the active form of vitamin D?

$$\mathrm{Cholecalciferol} \xrightarrow{\text{liver}} \mathrm{Calcidiol} \xrightarrow{\text{kidney}} \mathrm{Calcitriol}$$

Question 1

Which layer of the epidermis is responsible for anchoring the epidermis to the dermis and contains stem cells that replace superficial keratinocytes?

Accepted Answer

Stratum basale

Question 2

A patient presents with a bluish tint to their skin after exposure to extreme cold. Which molecule is most directly responsible for this change in skin color?

Accepted Answer

Hemoglobin

Question 3

Which of the following best explains why the palms of the hands and soles of the feet have thick skin with five layers?

Accepted Answer

They require additional protection from abrasion and impact.

Question 4

What is the primary function of melanin produced by melanocytes in the skin?

Accepted Answer

To protect skin cells from ultraviolet (UV) radiation

Question 5

Which pigment accumulates in the epidermis, deep dermis, and subcutaneous layer, and can be converted to vitamin A?

Accepted Answer

Carotene

Question 6

A patient with adrenal insufficiency develops increased skin pigmentation. Which hormone is most likely elevated in this condition?

Accepted Answer

Melanocyte-stimulating hormone (MSH)

Question 7

Which type of sweat gland is primarily responsible for cooling the surface of the skin and excreting water and electrolytes?

Accepted Answer

Eccrine (merocrine) sweat gland

Question 8

During the repair of the integument following an injury, which cells are responsible for cleaning the area by removing debris and pathogens?

Accepted Answer

Macrophages

Question 9

Which structure in the skin is responsible for detecting touch in hairless skin?

Accepted Answer

Merkel discs

Question 10

A person with albinism lacks skin pigmentation due to a deficiency in which cell type or pigment?

Accepted Answer

Melanocytes

Question 11

Which of the following best describes the process by which vitamin D is synthesized in the skin?

Accepted Answer

Epidermal cells produce cholecalciferol in the presence of UV radiation, which is then converted to calcitriol by the liver and kidneys.

Question 12

Which gland produces a secretion that lubricates and protects the hair shaft and inhibits bacterial growth?

Accepted Answer

Sebaceous gland

Question 13

Which of the following is a function of the integumentary system?

Accepted Answer

Synthesis of vitamin D to aid calcium uptake

Question 14

A patient presents with yellowing of the skin and the whites of the eyes. Which condition is most likely responsible for this symptom?

Accepted Answer

Jaundice

Question 15

Which structure is responsible for producing nonliving hairs and is surrounded by a dense connective tissue sheath?

Accepted Answer

Hair follicle

Question 16

Which phase of integumentary repair involves the formation of granulation tissue and proliferation of fibroblasts and endothelial cells?

Accepted Answer

Proliferation phase

Question 17

Which of the following changes is NOT typically associated with aging of the integumentary system?

Accepted Answer

Vitamin D production declines

Question 18

Which equation best represents the conversion of cholecalciferol to calcitriol, the active form of vitamin D?

Accepted Answer

$$\mathrm{Cholecalciferol} \xrightarrow{	ext{liver}} \mathrm{Calcidiol} \xrightarrow{	ext{kidney}} \mathrm{Calcitriol}$$

Question 19

Which sweat gland is most likely to be activated during emotional stress and is associated with odorous secretions in the armpits and pubic region?

Accepted Answer

Apocrine sweat gland

Question 20

A patient with psoriasis presents with pitted nails. Which structure is most likely affected?

Accepted Answer

Nail body

The Integumentary System: Structure, Pigmentation, and Specialized Cells

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