Question 1

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

Accepted Answer

It receives nutrients and oxygen by diffusion from capillaries in the dermis.

Question 2

A patient presents with yellowing of the skin and the whites of the eyes. Which physiological process is most likely responsible for this condition?

Accepted Answer

Accumulation of bile pigments due to liver dysfunction.

Question 3

Which layer of the epidermis is responsible for the formation of new keratinocytes and is attached to the basement membrane?

Accepted Answer

Stratum basale

Question 4

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

Accepted Answer

Increased risk of dehydration due to loss of water resistance in the skin.

Question 5

Which of the following best describes the role of melanocytes in the skin?

Accepted Answer

They produce melanin, which protects against ultraviolet (UV) radiation.

Question 6

A patient with severe burns loses a significant amount of water through the skin. Which process is primarily responsible for this increased water loss?

Accepted Answer

Increased insensible perspiration due to damage to the stratum corneum.

Question 7

Which of the following glands is responsible for producing a thick, odorous secretion that is a nutrient source for bacteria, leading to body odor?

Accepted Answer

Apocrine sweat glands

Question 8

A deficiency in vitamin D$$_3$$ can lead to which of the following conditions, and why?

Accepted Answer

Rickets, because vitamin D$$_3 is $$essential for calcium and phosphate absorption in the small intestine.

Question 9

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

Accepted Answer

Thick skin contains five layers of keratinocytes, including the stratum lucidum, and is found on the palms and soles.

Question 10

A patient is experiencing a loss of skin turgor. Which of the following is the most likely cause?

Accepted Answer

Dehydration, which reduces the water content in the dermis.

Question 11

Which of the following best describes the process by which the skin repairs itself after an injury?

Accepted Answer

Mast cells trigger inflammation, a scab forms, macrophages clean the area, and fibroblasts produce scar tissue.

Question 12

Which of the following is a function of the subcutaneous (hypodermis) layer?

Accepted Answer

Stabilizes the position of the skin and stores energy as adipose tissue.

Question 13

A person with Addison’s disease may develop a bronze skin color due to increased production of which hormone?

Accepted Answer

Melanocyte-stimulating hormone (MSH)

Question 14

Which of the following best explains why dark-skinned individuals are less likely to develop skin cancer from UV exposure?

Accepted Answer

They have larger and more numerous melanosomes that provide greater protection against DNA damage.

Question 15

Which of the following structures is responsible for detecting deep pressure and vibration in the skin?

Accepted Answer

Lamellar (Pacinian) corpuscles

Question 16

A patient presents with pitted nails. Which underlying condition is most likely responsible for this change in nail structure?

Accepted Answer

Psoriasis, a skin disease marked by red, scaly patches

Question 17

Which of the following best describes the function of sebum produced by sebaceous glands?

Accepted Answer

Lubricates and protects the hair shaft, and inhibits bacterial growth.

Question 18

A person with cyanosis will most likely exhibit which of the following symptoms, and what is the underlying cause?

Accepted Answer

Bluish skin due to decreased oxygenation of hemoglobin.

Question 19

Which of the following is a real-life example of the interaction between sunlight and vitamin D$$_3$$ production in the skin?

Accepted Answer

A person living in northern latitudes during winter may develop rickets due to insufficient UV exposure for vitamin D$$_3$$ synthesis.

Question 20

Which of the following best explains the structural basis for hair texture and color?

Accepted Answer

The shape of the hair follicle determines texture, while the type and amount of melanin determine color.

Chapter 5: The Integumentary System – Structure and Function

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