Question 1

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

Accepted Answer

It provides a barrier against biological, chemical, and physical assaults by forming 20–30 layers of dead, keratinized cells.

Question 2

A patient presents with a bluish-gray tint to their skin and mucous membranes. Which of the following is the most likely physiological explanation?

Accepted Answer

Poor oxygenation of hemoglobin, resulting in cyanosis.

Question 3

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

Accepted Answer

Dermal papillae forming friction ridges in thick skin.

Question 4

A surgeon is planning an incision on the abdomen. According to the concept of cleavage (tension) lines, which orientation of the incision will promote faster healing and less scarring?

Accepted Answer

Parallel to the cleavage lines.

Question 5

Which of the following best explains why the skin is considered an excretory organ?

Accepted Answer

It releases metabolic wastes such as ammonia, urea, and uric acid in sweat.

Question 6

A patient with a large, spreading brown-to-black patch on their skin is diagnosed with melanoma. Which of the following characteristics is NOT part of the ABCDE rule for melanoma detection?

Accepted Answer

Depth of the lesion

Question 7

Which of the following is a correct description of the function of dendritic (Langerhans) cells in the epidermis?

Accepted Answer

They are phagocytes and key activators of the immune system.

Question 8

Which pigment is responsible for the yellow to orange hue of the skin, and in which layer does it primarily accumulate?

Accepted Answer

Carotene; stratum corneum and hypodermis

Question 9

A person suffers a burn that affects the epidermis and the entire dermis, resulting in a painless, charred area. According to burn classification, what type of burn is this?

Accepted Answer

Third-degree (full-thickness) burn

Question 10

Which of the following best describes the secretion of eccrine sweat glands?

Accepted Answer

A hypotonic solution of 99% water, salts, dermcidin, and metabolic wastes.

Question 11

Which of the following is a function of the papillary layer of the dermis?

Accepted Answer

Contains dermal papillae that house capillary loops and sensory receptors.

Question 12

A patient with a genetic disorder has a defect in desmosomes. Which of the following symptoms would most likely be observed?

Accepted Answer

Fragile skin that blisters easily due to loss of cell-to-cell adhesion.

Question 13

Which of the following best explains why third-degree burns are considered critical if they cover more than 10% of the body?

Accepted Answer

They result in loss of fluids containing proteins and electrolytes, leading to dehydration and electrolyte imbalance.

Question 14

Which of the following is NOT a function of the integumentary system?

Accepted Answer

Production of red blood cells

Question 15

A person with a liver disorder develops a yellowish discoloration of the skin. What is the physiological basis for this change?

Accepted Answer

Accumulation of bilirubin in body tissues, resulting in jaundice.

Question 16

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

Accepted Answer

Cells accumulate keratohyaline granules and fill with keratin as they move from the stratum granulosum to the surface.

Question 17

Which of the following is a correct statement about the hypodermis?

Accepted Answer

It is not part of the skin but anchors the skin to underlying structures and provides insulation.

Question 18

Which of the following best explains the difference in skin color among individuals?

Accepted Answer

The form, amount made, and amount of melanin retained in the skin.

Question 19

Which of the following is a correct description of the function of sebaceous (oil) glands?

Accepted Answer

They secrete sebum, which softens and lubricates hair and skin, waterproofs the skin, and has bactericidal action.

Question 20

A patient presents with silvery-white scars on the abdomen after rapid weight gain. What is the most likely cause of these marks?

Accepted Answer

Dermal tears resulting in striae (stretch marks).

The Integumentary System: Structure, Function, and Clinical Relevance

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