Question 1

Which of the following best describes the main function of keratinocytes in the epidermis?

Accepted Answer

They produce keratin, a protein that provides waterproofing and protection.

Question 2

A patient presents with a deep laceration that extends through the entire thickness of the skin, including both the epidermis and dermis. According to the classification of burns and wounds, what type of injury is this?

Accepted Answer

Third-degree (full-thickness) injury

Question 3

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

Accepted Answer

Stratum lucidum

Question 4

A surgeon is planning an incision on the skin. To minimize scarring, the incision should be made parallel to which of the following?

Accepted Answer

Lines of cleavage (tension lines)

Question 5

Which of the following best explains why the stratum lucidum appears clear under the microscope?

Accepted Answer

It contains eleidin, a transparent, lipid-rich protein intermediate in keratin formation.

Question 6

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

Accepted Answer

Increased risk of bacterial infections due to lack of bactericidal secretions

Question 7

Which of the following is a function of the arrector pili muscle?

Accepted Answer

Contracting to pull the hair follicle upright and cause 'goosebumps'

Question 8

A patient with cyanosis is most likely experiencing which of the following?

Accepted Answer

Reduced oxygenation of hemoglobin, resulting in a bluish skin color

Question 9

Which of the following best describes the composition and function of the hypodermis (subcutaneous tissue)?

Accepted Answer

It consists of areolar connective tissue and adipose tissue, serving as a shock absorber and insulator.

Question 10

A person with a mutation that prevents the formation of friction ridges would most likely lack which of the following?

Accepted Answer

Fingerprints

Question 11

Which of the following best explains why hair turns gray or white with age?

Accepted Answer

Decreased melanin production and replacement of pigment with air bubbles in the hair shaft

Question 12

Which of the following is a correct description of the difference between eccrine and apocrine sweat glands?

Accepted Answer

Eccrine glands secrete a watery, odorless sweat directly onto the skin surface, while apocrine glands secrete a thicker, protein-rich sweat into hair follicles.

Question 13

A patient suffers a burn that covers the entire anterior and posterior surface of both lower limbs. According to the Rule of Nines, what percentage of the body surface area is affected?

Accepted Answer

$$36\%$$

Question 14

Which of the following is NOT a function of the skin?

Accepted Answer

Production of red blood cells

Question 15

A patient with a genetic defect in the epidermal growth factor (EGF) receptor would most likely experience which of the following?

Accepted Answer

Impaired keratinocyte proliferation and delayed wound healing

Question 16

Which of the following best describes the role of dendritic (Langerhans) cells in the epidermis?

Accepted Answer

They activate the immune system by acting as antigen-presenting cells.

Question 17

A person with a deficiency in carotene would most likely exhibit which of the following symptoms?

Accepted Answer

Reduced vitamin A synthesis, potentially affecting vision

Question 18

Which of the following best explains why the skin is able to act as a blood reservoir?

Accepted Answer

The dermis contains an extensive network of blood vessels that can hold about $$5\% of $$the body's total blood volume.

Question 19

A patient presents with a wound that is healing abnormally slowly. Which of the following factors is most likely contributing to the delayed healing?

Accepted Answer

Impaired function of fibroblasts in the dermis

Question 20

Which of the following best describes the function of the acid mantle of the skin?

Accepted Answer

It retards bacterial replication by maintaining an acidic environment.

The Integumentary System: Structure, Function, and Clinical Relevance

Study Guide - Practice Questions

Study Guide - Flashcards