Question 1

Which layer of the epidermis is responsible for the continuous regeneration of skin cells, and what is the main cell type found there?

Accepted Answer

Stratum basale; stem cells and keratinocytes

Question 2

A patient presents with a yellowish tint to their skin and eyes. Which pigment is most likely responsible, and what is a common underlying cause?

Accepted Answer

Bilirubin (jaundice); liver dysfunction preventing excretion

Question 3

Which of the following best explains why thick skin is found on the palms of the hands and soles of the feet?

Accepted Answer

These areas experience more abrasion and need extra protection, so they have an additional layer, the stratum lucidum

Question 4

A person with albinism has very light skin and hair. What is the underlying cause of this condition?

Accepted Answer

Melanocytes present but unable to produce melanin

Question 5

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

Accepted Answer

Phagocytose pathogens and activate immune responses

Question 6

A patient develops a blister after wearing tight shoes. Which anatomical feature is directly involved in the formation of this blister?

Accepted Answer

Fluid accumulation between the epidermis and the dermis

Question 7

Which of the following best explains why a person’s skin appears blue (cyanosis) during severe hypoxia?

Accepted Answer

Decreased oxygenation of hemoglobin in the blood

Question 8

Which of the following is a function of the eccrine (merocrine) sweat glands?

Accepted Answer

Produce a watery secretion for thermoregulation

Question 9

A person with a deep cut that damages the dermis but not the hypodermis will likely experience which of the following?

Accepted Answer

Bleeding due to damage of blood vessels in the dermis

Question 10

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

Accepted Answer

Melanin covers the keratinocyte nucleus, shielding DNA from UV radiation

Question 11

A patient with a genetic defect that prevents the formation of the stratum granulosum would most likely experience which of the following?

Accepted Answer

Increased risk of dehydration due to loss of the water barrier

Question 12

Which of the following structures is responsible for detecting light touch and discriminating shapes and textures?

Accepted Answer

Merkel cells

Question 13

A person with a diet high in orange vegetables develops a yellowish tint to their skin, especially in the stratum corneum. Which pigment is responsible?

Accepted Answer

Carotene

Question 14

Which of the following best explains why the stratum lucidum is only found in thick skin?

Accepted Answer

It provides an extra layer of protection in areas subject to high abrasion, such as palms and soles

Question 15

Which of the following best describes the process of vitamin D synthesis in the skin?

Accepted Answer

UV light converts a steroid in the skin to cholecalciferol, which is then converted to calcitriol in the kidneys

Question 16

A patient presents with small visible lines on their skin, especially on the back. These lines correspond to which anatomical feature, and why are they clinically significant?

Accepted Answer

Cleavage (tension) lines; incisions made parallel to these lines heal better

Question 17

Which of the following best explains the difference between vellus and terminal hair?

Accepted Answer

Terminal hair is thicker, coarser, and more pigmented than vellus hair

Question 18

A person is exposed to a cold environment, and their skin appears pale. What is the physiological explanation for this change?

Accepted Answer

Decreased blood flow in the dermis as the body conserves heat

Question 19

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

Accepted Answer

Contracts to make hair stand up, producing 'goosebumps'

Question 20

A patient has a wound that heals with scar tissue rather than complete regeneration of the original tissue. Which of the following best explains this process?

Accepted Answer

Fibroblasts produce collagen fibers to fill the gap, resulting in scar formation

Chapter 5

Guida di studio - Domande di pratica

Study guide - Flashcard