Q: Which of the following equations correctly represents the conversion of vitamin D in the skin upon exposure to UV radiation?

$$\mathrm{7\text{-}dehydrocholesterol \xrightarrow{UV} cholecalciferol}$$

Question 1

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

Accepted Answer

Production of red blood cells

Question 2

The skin acts as a physical barrier primarily due to which protein produced by keratinocytes?

Accepted Answer

Keratin

Question 3

Which layer of the epidermis is responsible for the continuous production of new keratinocytes?

Accepted Answer

Stratum basale

Question 4

A patient presents with blue coloration of the lips and under the nails. What is the most likely physiological explanation?

Accepted Answer

Decreased oxygen binding to hemoglobin

Question 5

Which of the following best describes the role of the papillary layer of the dermis?

Accepted Answer

Contains capillaries, lymphatic capillaries, and sensory neurons

Question 6

Why do parallel incisions to lines of cleavage in the skin heal better than perpendicular incisions?

Accepted Answer

Parallel incisions follow the arrangement of collagen and elastin fibers, reducing tension and scarring

Question 7

Which accessory structure of the skin is responsible for producing hairs that provide delicate touch sensations?

Accepted Answer

Hair follicles

Question 8

A person with a deficiency in vitamin D synthesis due to lack of sunlight exposure is at risk for which condition?

Accepted Answer

Rickets

Question 9

Which type of sweat gland is primarily responsible for thermoregulation and is found in most areas of the skin?

Accepted Answer

Merocrine (eccrine) sweat gland

Question 10

A patient presents with a waxy, pearly bump on the face. A biopsy confirms a skin cancer originating in the stratum basale. What is the most likely diagnosis?

Accepted Answer

Basal cell carcinoma

Question 11

Which pigment is responsible for the orange-yellow coloration in the skin and accumulates in the hypodermis?

Accepted Answer

Carotene

Question 12

Which structure is NOT part of the integumentary system but stabilizes the skin to underlying tissues and allows independent movement?

Accepted Answer

Hypodermis (subcutaneous layer)

Question 13

Which cells in the stratum spinosum play a key role in immunological surveillance?

Accepted Answer

Dendritic cells

Question 14

Which hormone increases epidermal thickness, accelerates wound healing, and increases the number of dendritic cells?

Accepted Answer

Sex hormones

Question 15

A patient with concave nails is most likely suffering from which underlying condition?

Accepted Answer

Blood disorder

Question 16

Which layer of the epidermis is only present in thick skin, such as the palms and soles?

Accepted Answer

Stratum lucidum

Question 17

Which of the following best explains why dark-skinned individuals have darker skin than light-skinned individuals?

Accepted Answer

Their melanocytes are more active and transfer larger melanosomes to keratinocytes

Question 18

Which structure is responsible for the sensation of deep pressure and vibration in the skin?

Accepted Answer

Lamellated corpuscles

Question 19

Which of the following equations correctly represents the conversion of vitamin D in the skin upon exposure to UV radiation?

Accepted Answer

$$\mathrm{7	ext{-}dehydrocholesterol \xrightarrow{UV} cholecalciferol}$$

Question 20

During skin repair, which tissue forms as a combination of blood clot, fibroblasts, and an extensive capillary network?

Accepted Answer

Granulation tissue

Overview of the Integumentary System: Functions and Clinical Significance

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