Question 1

Which of the following correctly lists the layers of the epidermis in thick skin, from deepest to most superficial?

Accepted Answer

Stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, stratum corneum

Question 2

A patient presents with a wound on the palm of their hand. Which type of epidermis is most likely affected, and what is a distinguishing feature of this type?

Accepted Answer

Thick skin; contains a stratum lucidum

Question 3

Which cell type is most abundant in the epidermis and is responsible for producing keratin?

Accepted Answer

Keratinocyte

Question 4

During the life cycle of a keratinocyte, what is the primary change that occurs as the cell moves from the stratum basale to the stratum corneum?

Accepted Answer

The cell becomes filled with keratin and eventually dies

Question 5

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

Accepted Answer

Thick skin contains a stratum lucidum and is found on palms and soles

Question 6

A burn patient loses the entire epidermis on their forearm. Which layer is responsible for regenerating new keratinocytes?

Accepted Answer

Stratum basale

Question 7

Which of the following scenarios best illustrates the function of the stratum corneum?

Accepted Answer

A person’s skin prevents water loss and acts as a barrier to pathogens

Question 8

If a mutation prevents keratinocytes from undergoing apoptosis as they reach the upper layers of the epidermis, what is the most likely consequence?

Accepted Answer

The stratum corneum would become abnormally thick and scaly

Question 9

Which of the following is true regarding the arrangement of cells in the epidermis?

Accepted Answer

Cells in the stratum granulosum begin to lose their nuclei and organelles

Question 10

A researcher is studying the rate of keratinocyte turnover in the epidermis. Which equation best represents the rate of cell migration from the stratum basale to the stratum corneum if $$N is $$the number of cells and $$t is $$time?

Accepted Answer

$$ \frac{dN}{dt} = k $$

Question 11

Which of the following best explains why thick skin is more resistant to abrasion than thin skin?

Accepted Answer

Thick skin has a thicker stratum corneum and an additional stratum lucidum

Question 12

A genetic disorder causes the stratum granulosum to be absent. Which of the following would most likely occur?

Accepted Answer

The skin would lose its waterproofing ability

The Epidermis: Structure, Cells, and Skin Types

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