Question 1

Which of the following best describes the major tissue type found in the epidermis of the skin?

Accepted Answer

Keratinized stratified squamous epithelium

Question 2

A patient presents with a wound that has penetrated through the stratum corneum and stratum granulosum but not reached the dermis. Which layer is most likely still intact?

Accepted Answer

Stratum spinosum

Question 3

Which of the following statements about the stratum basale is correct?

Accepted Answer

It contains mitotically active cells responsible for regenerating the epidermis.

Question 4

Which cell type in the epidermis is primarily responsible for producing the pigment that protects against UV radiation?

Accepted Answer

Melanocytes

Question 5

A mutation that disrupts tight junctions between keratinocytes would most likely result in which of the following?

Accepted Answer

Increased permeability of the epidermis to water and pathogens

Question 6

Which layer of the dermis is responsible for fingerprints and contains dermal papillae?

Accepted Answer

Papillary layer

Question 7

The reticular layer of the dermis is primarily composed of which type of tissue?

Accepted Answer

Dense irregular connective tissue

Question 8

Which of the following best explains the formation of stretch marks (striae) in the skin?

Accepted Answer

Tearing of collagen fibers in the dermis due to rapid stretching

Question 9

A patient with a genetic defect in collagen synthesis would most likely have abnormalities in which skin layer?

Accepted Answer

Dermis

Question 10

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

Accepted Answer

They act as immune sentinels, detecting and presenting antigens.

Question 11

If a burn destroys the entire epidermis and the papillary layer of the dermis, which of the following structures is most likely also damaged?

Accepted Answer

Dermal papillae

Question 12

Which of the following is a correct sequence of the layers of the epidermis from deep to superficial in thick skin?

Accepted Answer

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

Question 13

Which of the following best explains why incisions made parallel to cleavage (tension) lines in the skin heal better?

Accepted Answer

They cause less disruption of collagen fibers, resulting in less scarring.

Question 14

A patient with a loss of function in Merkel cells would most likely experience which of the following symptoms?

Accepted Answer

Reduced tactile (touch) sensation

Question 15

Which of the following equations best represents the relationship between the thickness of the epidermis ($$t_e$$), the number of cell layers ($$n$$), and the average thickness of each layer ($$t_l$$)?

Accepted Answer

$$t_e = n 	imes t_l$$

Question 16

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

Accepted Answer

Acts as a barrier to water loss and protects against abrasion

Question 17

A patient with a mutation that prevents the formation of desmosomes in the epidermis would most likely experience which of the following?

Accepted Answer

Loss of cohesion between keratinocytes, leading to blistering

Question 18

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

Accepted Answer

Insulation and energy storage

Question 19

Which of the following best explains why the skin is able to resist tearing when stretched in multiple directions?

Accepted Answer

The reticular layer of the dermis contains dense irregular connective tissue with collagen fibers arranged in multiple directions.

Question 20

A patient with a deficiency in elastic fibers in the dermis would most likely present with which of the following symptoms?

Accepted Answer

Decreased skin elasticity and increased wrinkling

The Structure and Function of the Skin: Epidermis and Dermis

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