$$\text{7-dehydrocholesterol} \xrightarrow{UV~light} \text{cholecalciferol (vitamin D}_3\text{)}$$

Question 1

Which layer of the skin is primarily responsible for synthesizing vitamin D$$_3$$ when exposed to sunlight?

Accepted Answer

Stratum basale

Question 2

A patient presents with a third-degree burn on their forearm. Which of the following integumentary functions is MOST compromised?

Accepted Answer

Protection from infection

Question 3

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

Accepted Answer

They synthesize melanin to protect against UV radiation.

Question 4

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

Accepted Answer

Hypodermis

Question 5

A person with a deficiency in vitamin D$$_3 is $$likely to experience which of the following symptoms?

Accepted Answer

Weak and flexible bones due to poor calcium absorption

Question 6

Which layer of the epidermis contains stem cells that continually divide to replace lost cells at the surface?

Accepted Answer

Stratum basale

Question 7

During the repair of the integument, which phase involves the formation of granulation tissue?

Accepted Answer

Migratory phase

Question 8

Which of the following glands is most responsible for producing a watery secretion that cools the body through evaporation?

Accepted Answer

Eccrine sweat glands

Question 9

A patient has pale, bluish skin coloration (cyanosis). Which physiological change is most likely responsible?

Accepted Answer

Decreased oxygen supply to the skin

Question 10

Which of the following statements about the hypodermis is TRUE?

Accepted Answer

It stabilizes the position of the skin relative to underlying tissues.

Question 11

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

Accepted Answer

Protection from UV light

Question 12

Which type of skin cancer is most likely to metastasize through the lymphatic system?

Accepted Answer

Malignant melanoma

Question 13

Which layer of the dermis contains capillaries, lymphatic vessels, and sensory neurons supplying the skin surface?

Accepted Answer

Papillary layer

Question 14

A person develops a blister after a burn. Which type of burn is most likely responsible?

Accepted Answer

Second-degree burn

Question 15

Which of the following best explains why elderly individuals are more prone to skin infections?

Accepted Answer

Thinning of the epidermis and reduced macrophage activity

Question 16

Which of the following is TRUE regarding the stratum corneum?

Accepted Answer

It consists of 15-30 layers of dead, keratinized cells.

Question 17

Which of the following equations best represents the conversion of vitamin D$$_3 in $$the body?

Accepted Answer

$$	ext{7-dehydrocholesterol} \xrightarrow{UV~light} 	ext{cholecalciferol (vitamin D}_3	ext{)}$$

Question 18

Which of the following is a plausible consequence of reduced eccrine sweat gland activity in an elderly patient?

Accepted Answer

Increased risk of overheating due to impaired thermoregulation

Question 19

Which of the following best describes the process of keratinization in the epidermis?

Accepted Answer

Cells migrate upward, fill with keratin, and die as they reach the stratum corneum.

Question 20

A patient presents with thickened, shiny scar tissue after a deep skin injury. What is this type of scar called?

Accepted Answer

Keloid

The Integumentary System: Structure and Function

Study Guide - Practice Questions