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

Question 1

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

Accepted Answer

Stratum germinativum (basale)

Question 2

A patient presents with a bluish tint to their skin after exposure to cold. Which physiological process best explains this coloration?

Accepted Answer

Vasoconstriction leading to decreased oxygen delivery

Question 3

Which layer of the skin contains the majority of blood vessels, nerves, and connective tissue?

Accepted Answer

Dermis

Question 4

Why is UV exposure necessary for vitamin D synthesis in the skin?

Accepted Answer

It converts a cholesterol derivative into vitamin D precursor

Question 5

Which epidermal layer is only found in thick skin, such as the palms and soles?

Accepted Answer

Stratum lucidum

Question 6

A topical medication is designed to be absorbed slowly through the skin. Which property of the stratum corneum allows for this controlled release?

Accepted Answer

Lipid-rich, water-resistant barrier

Question 7

Which pigment is responsible for the yellow-orange coloration of the skin and can be converted to vitamin A?

Accepted Answer

Carotene

Question 8

A mole on the skin begins to change shape and color and spreads to nearby lymph nodes. Which type of skin cancer is most likely?

Accepted Answer

Melanoma

Question 9

Which function of the integumentary system is directly related to the synthesis of calcitriol?

Accepted Answer

Absorption of calcium in the digestive tract

Question 10

Which layer of the epidermis is characterized by flattened, dead cells that provide a tough, protective outer surface?

Accepted Answer

Stratum corneum

Question 11

A patient with a genetic mutation affecting melanocyte function is likely to experience which of the following?

Accepted Answer

Abnormal skin pigmentation

Question 12

Which of the following best describes the role of the hypodermis?

Accepted Answer

It stores lipids and connects skin to underlying structures

Question 13

Which equation best represents the conversion of 7-dehydrocholesterol to vitamin D$$_3 in $$the skin upon UV exposure?

Accepted Answer

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

Question 14

Which of the following is a function of the integumentary system related to homeostasis?

Accepted Answer

Regulation of heat exchange with the environment

Question 15

Which cell type in the epidermis is primarily responsible for producing the protein that makes skin tough and water-resistant?

Accepted Answer

Keratinocytes

Question 16

A patient with a wound that does not bleed has likely damaged which layer of the skin?

Accepted Answer

Epidermis

Question 17

Which of the following best explains why thick skin is found on the palms and soles?

Accepted Answer

It has an extra layer (stratum lucidum) for increased protection

Question 18

Which process is most directly affected in a patient with insufficient UV exposure?

Accepted Answer

Vitamin D synthesis

Question 19

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

Accepted Answer

Production of insulin

Question 20

Which skin cancer originates in the stratum basale and is usually treated by surgical removal?

Accepted Answer

Basal cell carcinoma

Integumentary System: Structure and Function of Skin Layers

스터디 가이드 - 연습 문제