Question 1

Which of the following best describes the primary function of the stratum corneum in the epidermis?

Accepted Answer

It provides a tough, water-resistant barrier that protects underlying tissues from abrasion, penetration, and water loss.

Question 2

A patient presents with a yellowish tint to their skin and eyes. Which pigment is most likely responsible for this change, and what underlying condition might it indicate?

Accepted Answer

Bilirubin; liver disorder (jaundice)

Question 3

Which layer of the skin is primarily responsible for providing strength and elasticity due to its high content of collagen and elastic fibers?

Accepted Answer

Reticular layer of the dermis

Question 4

A surgeon is planning an incision on a patient’s back. To minimize scarring and promote faster healing, the incision should be made:

Accepted Answer

Parallel to the cleavage (tension) lines

Question 5

Which of the following best explains why a person sweats more during exercise?

Accepted Answer

Activation of eccrine sweat glands by the nervous system to promote evaporative cooling

Question 6

A patient with a severe burn loses large amounts of water and electrolytes through their skin. Which property of the skin has been compromised?

Accepted Answer

Physical barrier

Question 7

Which of the following cells in the epidermis is primarily responsible for activating the immune response by presenting foreign antigens to T cells?

Accepted Answer

Dendritic (Langerhans) cells

Question 8

A person with fair skin appears flushed and red after running a marathon. What is the physiological explanation for this change in skin color?

Accepted Answer

Dilation of dermal blood vessels increases blood flow, making hemoglobin more visible

Question 9

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

Accepted Answer

It contracts to cause 'goose bumps' by pulling the hair follicle upright.

Question 10

A child is diagnosed with a genetic disorder that prevents the formation of desmosomes in the epidermis. Which of the following symptoms would most likely be observed?

Accepted Answer

Fragile skin that blisters easily due to poor cell-to-cell adhesion

Question 11

Which of the following equations best represents the relationship between sweat production and body temperature regulation?

Accepted Answer

$Q = m 	imes L_v$

Question 12

A patient presents with a bluish tint to their skin (cyanosis). Which of the following is the most likely cause?

Accepted Answer

Low oxygenation of hemoglobin in the blood

Question 13

Which of the following best explains why the hypodermis is important for thermoregulation?

Accepted Answer

It is composed mainly of adipose tissue, which insulates the body and reduces heat loss.

Question 14

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

Accepted Answer

It provides antibacterial properties and lubricates the skin and hair.

Question 15

A patient with a genetic mutation cannot produce keratin. Which of the following consequences would most likely occur?

Accepted Answer

The skin would lose its protective, tough barrier and be more susceptible to injury and infection.

Question 16

Which of the following best describes 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, milky sweat into hair follicles.

Question 17

A person develops a black-and-blue mark (ecchymosis) after bumping their leg. What is the physiological basis for this discoloration?

Accepted Answer

Clotted blood beneath the skin due to broken blood vessels

Question 18

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

Accepted Answer

They result from dermal papillae lying on top of dermal ridges, creating epidermal ridges unique to each person.

Question 19

A patient with a mutation affecting lamellar granule production would most likely experience which of the following symptoms?

Accepted Answer

Increased risk of dehydration due to impaired water-resistant barrier in the stratum granulosum

Question 20

Which of the following best describes the process by which the skin synthesizes vitamin D?

Accepted Answer

Keratinocytes use UV radiation to convert 7-dehydrocholesterol to cholecalciferol (vitamin D3), which is then activated in the liver and kidneys.

The Integumentary System: Structure and Function

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