$$\text{7-dehydrocholesterol} + \text{UVB} \rightarrow \text{cholecalciferol (vitamin D}_3\text{)}$$

Question 1

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

Accepted Answer

Production of insulin for glucose regulation

Question 2

Keratinocytes are the most abundant cell type in the epidermis. What is their primary function?

Accepted Answer

Produce keratin, a water-insoluble protein that hardens skin structure

Question 3

Which layer of the skin contains blood vessels, nerves, and glands?

Accepted Answer

Dermis

Question 4

A patient presents with a deficiency in vitamin D. Which function of the skin is most directly affected?

Accepted Answer

Synthesis of vitamin D for calcium metabolism

Question 5

Which cell type in the epidermis is responsible for immune defense and migrates from bone marrow?

Accepted Answer

Langerhans cells

Question 6

During fetal development, which structure protects the skin from amniotic fluid?

Accepted Answer

Vernix caseosa

Question 7

Which of the following best describes the role of melanocytes in the skin?

Accepted Answer

They synthesize melanin to protect against UV damage.

Question 8

If a person is exposed to cold temperatures, which physiological response involving the skin helps conserve heat?

Accepted Answer

Dermal blood vessels constrict

Question 9

Which equation best represents the relationship between vitamin D synthesis and sunlight exposure in the skin?

Accepted Answer

$$	ext{7-dehydrocholesterol} + 	ext{UVB} ightarrow 	ext{cholecalciferol (vitamin D}_3	ext{)}$$

Question 10

Which of the following is TRUE regarding the epidermis?

Accepted Answer

It is made of keratinized, stratified squamous epithelium.

Question 11

A burn patient loses the ability to regulate body temperature. Which function of the skin has been compromised?

Accepted Answer

Thermoregulation via sweat glands and blood vessels

Question 12

Which cell type in the epidermis is associated with sensory reception for touch?

Accepted Answer

Merkel cells

Question 13

Which of the following is a correct sequence for the development of the skin during embryogenesis?

Accepted Answer

Ectoderm and mesoderm form the epidermis and dermis

Question 14

Which of the following best explains why the skin is considered a reservoir for blood?

Accepted Answer

Blood can be shunted from the skin to the general circulation when needed.

Question 15

Which of the following is a function of sweat glands in the skin?

Accepted Answer

Excretion of nitrogenous wastes and regulation of body temperature

Question 16

A patient with damage to their Merkel cells would most likely experience which symptom?

Accepted Answer

Reduced ability to sense touch

Question 17

Which of the following statements about Langerhans cells is correct?

Accepted Answer

They arise in bone marrow and migrate to the epidermis to participate in immune defense.

Question 18

Which of the following is a correct description of the skin's role in excretion?

Accepted Answer

The skin excretes nitrogenous wastes such as urea via sweat.

Question 19

Which of the following best describes the structure of the epidermis?

Accepted Answer

It is made of keratinized, stratified squamous epithelium.

Question 20

Which of the following is a multi-step process involving the skin's response to injury?

Accepted Answer

Keratinocytes proliferate, Langerhans cells activate immune response, and melanocytes increase melanin production.

Integumentary System: Structure, Function, and Cell Types

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