Question 1

Which of the following best describes the main function of melanin in the integumentary system?

Accepted Answer

Melanin protects underlying tissues from ultraviolet (UV) radiation by absorbing and dissipating UV rays.

Question 2

A patient presents with a deep laceration that extends through the epidermis and into the reticular layer of the dermis. Which of the following structures is most likely to be damaged?

Accepted Answer

Sebaceous gland

Question 3

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

Accepted Answer

Stratum basale

Question 4

A child with a vitamin D3 deficiency develops rickets. Which step in the vitamin D3 metabolic pathway is most directly impaired by a lack of sunlight exposure?

Accepted Answer

Production of cholecalciferol in the skin from 7-dehydrocholesterol

Question 5

Which of the following statements about the stratum corneum is correct?

Accepted Answer

It is composed of 15 to 30 layers of dead, keratinized cells.

Question 6

A surgeon plans to make an incision on a patient’s back. To minimize scarring, the incision should be made:

Accepted Answer

Parallel to tension lines in the dermis

Question 7

Which of the following best explains why superficial layers of the epidermis in light-skinned individuals lack pigmentation?

Accepted Answer

Melanosomes are destroyed by lysosomes as keratinocytes move beyond the stratum spinosum.

Question 8

Which of the following is NOT a function of eccrine sweat glands?

Accepted Answer

Secreting a thick, odorous sweat into hair follicles

Question 9

A person consumes large amounts of carrots and develops an orange tint to their skin. This is most likely due to the accumulation of:

Accepted Answer

Carotene

Question 10

Which of the following best describes the difference between thick and thin skin?

Accepted Answer

Thick skin has five layers of epidermis, including the stratum lucidum, while thin skin has four.

Question 11

A patient with albinism has normal numbers of melanocytes but lacks skin pigmentation. What is the most likely explanation?

Accepted Answer

The melanocytes are incapable of producing melanin.

Question 12

Which of the following structures is primarily responsible for the formation of fingerprints?

Accepted Answer

Dermal papillae and epidermal ridges

Question 13

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

Accepted Answer

It stabilizes the position of the skin relative to underlying tissues and is primarily composed of adipose tissue.

Question 14

Which of the following is a correct sequence of layers in the epidermis of thick skin, from deep to superficial?

Accepted Answer

Stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, stratum corneum

Question 15

A patient has a wound that is slow to heal and is prone to infection. Which of the following structures, if damaged, would most likely explain the impaired immune response in the skin?

Accepted Answer

Dendritic (Langerhans) cells in the stratum spinosum

Question 16

Which of the following best explains why incisions made parallel to tension lines in the dermis heal with less scarring?

Accepted Answer

They follow the orientation of collagen and elastic fibers, reducing the likelihood of wound reopening.

Question 17

Which of the following is a function of sebum produced by sebaceous glands?

Accepted Answer

Inhibits bacterial growth and lubricates the hair shaft

Question 18

Which of the following best describes the process of keratinization?

Accepted Answer

The production and accumulation of keratin in maturing keratinocytes as they move from the stratum basale to the stratum corneum

Question 19

A person receives a subcutaneous injection. Into which layer is the medication delivered?

Accepted Answer

Hypodermis (subcutaneous layer)

Question 20

Which of the following is true regarding the difference in melanin distribution between light-skinned and dark-skinned individuals?

Accepted Answer

Dark-skinned individuals have larger and more numerous melanosomes, and melanosomes persist into more superficial layers.

Chapter 5: The Integumentary System – Structured Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards