Q: Which of the following equations correctly represents the conversion of a cholesterol-related precursor to active vitamin D in the skin?

$$\mathrm{UV\ light} + 7\text{-dehydrocholesterol} \rightarrow \mathrm{cholecalciferol\ (vitamin\ D_3$)}$$

Question 1

Which of the following is NOT considered an accessory structure of the integumentary system?

Accepted Answer

Hypodermis

Question 2

A patient presents with pale skin and bluish lips after prolonged exposure to cold. Which physiological process best explains this change in skin color?

Accepted Answer

Sustained reduction in dermal blood flow leading to cyanosis

Question 3

Which layer of the epidermis is responsible for the formation of fingerprints?

Accepted Answer

Stratum basale (germinativum)

Question 4

A person with a genetic mutation that prevents the production of keratin would most likely experience which of the following symptoms?

Accepted Answer

Fragile skin that is easily damaged due to lack of structural protein

Question 5

Which of the following best describes the function of the arrector pili muscle?

Accepted Answer

Contracts to produce goose bumps and elevate hair

Question 6

A surgeon is planning an incision on the skin. To minimize scarring, the incision should be made:

Accepted Answer

Parallel to the lines of cleavage

Question 7

Which of the following equations correctly represents the conversion of a cholesterol-related precursor to active vitamin D in the skin?

Accepted Answer

$$\mathrm{UV\ light} + 7	ext{-dehydrocholesterol} ightarrow \mathrm{cholecalciferol\ (vitamin\ D_3$)}$$

Question 8

Which cell type in the epidermis acts as a wandering macrophage and is important for immune defense?

Accepted Answer

Langerhans cell

Question 9

A person develops stretch marks after rapid weight gain. Which layer of the skin is primarily affected?

Accepted Answer

Reticular layer of the dermis

Question 10

Which of the following glands is responsible for producing earwax?

Accepted Answer

Ceruminous gland

Question 11

A patient with a third-degree burn will have damage to which layers of the skin?

Accepted Answer

Entire thickness of the skin (epidermis and dermis)

Question 12

Which of the following is a function of the subcutaneous (hypodermis) layer?

Accepted Answer

Stabilization of the integument and storage of adipose tissue

Question 13

Which type of sweat gland is most responsible for thermoregulation?

Accepted Answer

Eccrine (merocrine) sweat gland

Question 14

A person living in a region with high UV exposure is more likely to have which adaptation in their skin?

Accepted Answer

Increased melanin production for UV protection

Question 15

Which of the following correctly matches the epidermal layer with its main function?

Accepted Answer

Stratum basale: Attachment to basal lamina and mitosis

Question 16

Which of the following is TRUE regarding sebaceous glands?

Accepted Answer

They secrete sebum via holocrine secretion

Question 17

Which of the following best explains why polar bears have black skin and hollow guard hairs?

Accepted Answer

Black skin absorbs heat and hollow hairs trap insulating air

Question 18

Which of the following structures is NOT found in thick skin?

Accepted Answer

Sebaceous glands

Question 19

Which of the following equations best represents the relationship between skin color and UV exposure?

Accepted Answer

$$\mathrm{Skin\ color} \propto \mathrm{Melanin\ concentration} 	imes \mathrm{UV\ exposure}$$

Question 20

Which of the following is a correct statement about the function of nails?

Accepted Answer

They provide protection for the tips of fingers and toes

The Integumentary System: Structure and Function

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