Question 1

The image above is a high-magnification micrograph of human skin. Which of the following best describes the wavy interface seen between the two main tissue layers?

Accepted Answer

It is the dermal-epidermal junction, where epidermal ridges interlock with dermal papillae to increase surface area for attachment.

Question 2

Which of the following is a primary function of the wavy interface (epidermal ridges and dermal papillae) seen in the image?

Accepted Answer

To increase the surface area for attachment between the epidermis and dermis, reducing the risk of separation under mechanical stress.

Question 3

Based on the image and your knowledge of skin histology, which layer is most superficial?

Accepted Answer

The wavy, pinkish-brown layer at the top of the image.

Question 4

Which of the following statements best explains why the epidermis (top layer in the image) lacks blood vessels?

Accepted Answer

The epidermis is composed of stratified squamous epithelium, which relies on diffusion from capillaries in the underlying dermis for nutrients and oxygen.

Question 5

If a splinter penetrates to the wavy interface seen in the image, which specific layer of the skin is affected?

Accepted Answer

Stratum basale

Question 6

The unique patterns formed by the wavy interface in the image are responsible for which of the following?

Accepted Answer

The creation of fingerprints, which are unique to each individual and do not change over a lifetime.

Question 7

Which of the following best describes the tissue type of the green-stained region at the bottom of the image?

Accepted Answer

Areolar connective tissue (papillary dermis)

Question 8

A patient suffers a burn that destroys the entire wavy interface and the tissue below it, as seen in the image. Which type of burn is this?

Accepted Answer

Third-degree (full-thickness) burn

Question 9

Which of the following best explains why the wavy interface is important for skin repair after injury?

Accepted Answer

It increases the number of stem cells available for regeneration and provides a scaffold for re-epithelialization.

Question 10

If the green-stained region in the image is damaged, which of the following symptoms is most likely to occur?

Accepted Answer

Reduced sensation of touch and increased risk of infection due to loss of capillaries and sensory neurons

Question 11

Which of the following equations best represents the relationship between the rate of epidermal cell migration ($$R$$), the time to reach the surface ($$t$$), and the thickness of the epidermis ($$d$$)?

Accepted Answer

$$R = d \div t$$

Question 12

Which of the following best explains why the epidermal ridges (wavy interface) are more pronounced in thick skin (such as the palms and soles)?

Accepted Answer

To enhance grip and tactile sensitivity by increasing friction and surface area.

Question 13

A mutation causes the loss of desmosomes in the cells of the uppermost layer in the image. Which of the following would most likely result?

Accepted Answer

Increased shedding of skin cells and loss of cohesion in the stratum corneum

Question 14

Which of the following best describes the process by which nutrients reach the most superficial cells in the image?

Accepted Answer

Diffusion from capillaries in the dermis through the layers of the epidermis

Question 15

If a patient has a genetic defect that reduces the production of keratin in the cells of the uppermost layer in the image, which of the following symptoms would most likely be observed?

Accepted Answer

Increased risk of dehydration and mechanical injury due to a weakened barrier

Anatomy and Physiology of the Integumentary System

Guida di studio - Domande di pratica

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