Question 1

Which of the following best describes the primary function of melanin in the skin?

Accepted Answer

To protect keratinocyte DNA from mutations induced by UV radiation

Question 2

A patient presents with pale skin (pallor) after a traumatic accident. Which physiological mechanism best explains this observation?

Accepted Answer

Decreased hemoglobin levels or vasoconstriction reducing blood flow in the dermis

Question 3

Which layer of the epidermis is responsible for the continuous replacement of dead keratinocytes lost from the skin surface?

Accepted Answer

Stratum basale

Question 4

A person living in northern Europe is more likely to have lighter skin compared to someone living near the equator. What is the evolutionary advantage of this adaptation?

Accepted Answer

Lighter skin allows for increased synthesis of vitamin D in regions with less UV radiation

Question 5

Which of the following structures is NOT considered part of the skin (cutaneous membrane) but plays a role in anchoring the skin to deeper tissues?

Accepted Answer

Hypodermis

Question 6

A patient with albinism is at increased risk for which of the following conditions due to the lack of tyrosinase activity?

Accepted Answer

Keratinocyte DNA damage from UV radiation

Question 7

Which of the following best explains why the epidermis is avascular?

Accepted Answer

It relies on diffusion of oxygen and nutrients from blood vessels in the dermis

Question 8

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

Accepted Answer

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

Question 9

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

Accepted Answer

Contracts to cause hair to stand up, producing 'goosebumps'

Question 10

A patient presents with cyanosis (bluish skin). Which of the following best explains this condition?

Accepted Answer

Hemoglobin in red blood cells is unable to bind oxygen

Question 11

Which of the following is a function of the acid mantle produced by sebaceous gland secretions?

Accepted Answer

Inhibits the growth of many pathogens on the skin

Question 12

Which of the following best describes the role of the reticular layer of the dermis?

Accepted Answer

Strengthens the dermis with collagen bundles and allows elasticity with elastic fibers

Question 13

A person who spends excessive time in the sun develops deep wrinkles at an early age. Which of the following best explains this phenomenon?

Accepted Answer

UV exposure accelerates the breakdown of collagen and elastic fibers in the dermis

Question 14

Which of the following glands is correctly matched with its secretion and function?

Accepted Answer

Mammary gland – produces milk, a modified sweat

Question 15

Which of the following best describes the process of thermoregulation by the integumentary system in response to increased body temperature?

Accepted Answer

Vasodilation of dermal blood vessels and increased sweat production

Question 16

Which of the following statements about the keratinocyte life cycle is correct?

Accepted Answer

Keratinocytes are produced in the stratum basale and migrate to the stratum corneum over 40–50 days

Question 17

Which of the following best explains why fingerprints are unique to each individual?

Accepted Answer

They are formed by genetically determined patterns of dermal and epidermal ridges

Question 18

Which of the following is a correct statement about the distribution of melanocytes in the skin?

Accepted Answer

The overall number of melanocytes is virtually identical among all individuals

Question 19

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

Accepted Answer

They act as phagocytes to protect skin and deeper tissues from pathogens

The Integumentary System: Structure, Function, and Clinical Relevance

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