Question 1

Which layer of the epidermis is primarily responsible for the continuous regeneration of skin cells?

Accepted Answer

Stratum basale

Question 2

A patient presents with a wound that only affects the epidermis. Which of the following is most likely to occur during healing?

Accepted Answer

Rapid regeneration from stem cells in the stratum basale

Question 3

Which cell type in the epidermis is responsible for producing the pigment melanin?

Accepted Answer

Melanocytes

Question 4

The stratum corneum is composed mainly of:

Accepted Answer

Dead, flattened keratinocytes filled with keratin

Question 5

Which of the following best describes the function of the epidermis in relation to water loss?

Accepted Answer

It prevents water loss by forming a waterproof layer

Question 6

A mutation in the gene coding for keratin would most likely affect which property of the epidermis?

Accepted Answer

Its structural strength and resistance to abrasion

Question 7

Which layer of the epidermis is only found in thick skin, such as the palms and soles?

Accepted Answer

Stratum lucidum

Question 8

If a person suffers a burn that destroys the entire epidermis but leaves the dermis intact, which process will allow the epidermis to regenerate?

Accepted Answer

Proliferation of stem cells in hair follicles and sweat glands

Question 9

Which of the following equations best represents the rate of epidermal cell turnover if $$N is $$the number of cells produced per day and $$L is $$the number of cells lost per day?

Accepted Answer

$$N - L$$

Question 10

A patient with albinism has a defect in which process of the epidermis?

Accepted Answer

Production of melanin by melanocytes

Question 11

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

Accepted Answer

It receives nutrients by diffusion from the underlying dermis

Question 12

A biopsy reveals an increased number of Langerhans cells in the epidermis. What is the most likely consequence?

Accepted Answer

Enhanced immune response to pathogens

Question 13

Which of the following is the correct order of layers in the epidermis from deepest to most superficial?

Accepted Answer

Stratum basale, stratum spinosum, stratum granulosum, stratum corneum

Question 14

Which function of the epidermis is most critical in preventing bacterial invasion?

Accepted Answer

Formation of a physical barrier by keratinized cells

Question 15

A person with a genetic defect in desmosome formation would most likely experience which symptom?

Accepted Answer

Fragile skin that blisters easily

Question 16

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

Accepted Answer

Keratinocytes migrate from the stratum basale to the surface, accumulating keratin and eventually dying

Question 17

If the rate of cell division in the stratum basale doubles, what is the most likely effect on the thickness of the stratum corneum over time?

Accepted Answer

It will increase

Question 18

Which equation best represents the relationship between the time $$t (in $$days) it takes for a keratinocyte to migrate from the stratum basale to the stratum corneum, given a migration rate $$r ($$cells/day) and a total distance $$d ($$cells)?

Accepted Answer

$$t = \frac{d}{r}$$

Question 19

Which of the following is NOT a function of the epidermis?

Accepted Answer

Production of red blood cells

Question 20

A patient with a deficiency in vitamin D synthesis is most likely to have a problem with which function of the epidermis?

Accepted Answer

Conversion of cholesterol to vitamin D upon exposure to UV light

Epidermis Review Worksheet Instructions

Guida di studio - Domande di pratica

Study guide - Flashcard