Q: Which formula best represents the process of mitotic division in the stratum basale, where one stem cell produces two daughter cells?

$$N_{final} = N_{initial} \times 2$$

Question 1

Which layer of the skin is primarily responsible for shock absorption and thermal insulation?

Accepted Answer

Hypodermis (superficial fascia)

Question 2

A patient presents with silvery white scars on their abdomen after rapid weight gain. What is the most likely cause of these marks?

Accepted Answer

Dermal tears due to extreme stretching

Question 3

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

Accepted Answer

Melanocytes

Question 4

If a surgeon wants to minimize scarring, they should make incisions parallel to which anatomical feature in the dermis?

Accepted Answer

Cleavage (tension) lines

Question 5

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

Accepted Answer

Stratum lucidum

Question 6

What is the primary function of dendritic (Langerhans) cells in the epidermis?

Accepted Answer

Activate the immune system

Question 7

Which layer of the epidermis contains stem cells that divide mitotically to replace lost skin cells?

Accepted Answer

Stratum basale

Question 8

A person develops calluses on their hands after repeated manual labor. What cellular process is responsible for this adaptation?

Accepted Answer

Accelerated mitosis of stem cells in the stratum basale

Question 9

Which of the following best describes the composition and function of the papillary layer of the dermis?

Accepted Answer

Areolar connective tissue; contains capillary loops and touch receptors

Question 10

Which structure in the skin is responsible for leaving unique fingerprint patterns?

Accepted Answer

Friction ridges formed by dermal and epidermal ridges

Question 11

A patient suffers a burn that destroys the entire epidermis and part of the dermis. Which layer is most likely to remain intact and provide insulation?

Accepted Answer

Hypodermis

Question 12

Which equation best represents the relationship between the number of layers in the epidermis and the type of skin (thick vs. thin)?

Accepted Answer

$$n_{thick} = n_{thin} + 1$$

Question 13

Which of the following is NOT a function of the stratum corneum?

Accepted Answer

Produce melanin

Question 14

What is the main reason why the epidermis is considered avascular?

Accepted Answer

It lacks blood vessels and receives nutrients via diffusion from the dermis

Question 15

Which cell type is most abundant in the epidermis and is responsible for producing a protein that gives skin its protective properties?

Accepted Answer

Keratinocytes

Question 16

A patient with a genetic defect in desmosome formation would most likely have issues with which epidermal cell type?

Accepted Answer

Keratinocytes

Question 17

Which layer of the dermis contains the cutaneous plexus, a network of blood vessels important for temperature regulation?

Accepted Answer

Reticular layer

Question 18

If the water-resistant glycolipid in the stratum granulosum is deficient, which physiological problem is most likely to occur?

Accepted Answer

Excessive water loss through the skin

Question 19

Which of the following best explains why flexure lines are visible on the palms and fingers?

Accepted Answer

Dermis is tightly secured to deeper structures, preventing easy sliding during joint movement

Question 20

Which formula best represents the process of mitotic division in the stratum basale, where one stem cell produces two daughter cells?

Accepted Answer

$$N_{final} = N_{initial} 	imes 2$$

Anatomy of the Integumentary System: Structure and Cells of the Skin

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