Question 1

Which layer of the epidermis is primarily responsible for mitosis and contains stem cells, melanocytes, and Merkel cells?

Accepted Answer

Stratum basale (germ layer)

Question 2

A patient presents with a genetic defect that impairs keratinization. Which epidermal layer would be most directly affected by this condition?

Accepted Answer

Stratum granulosum

Question 3

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

Accepted Answer

Melanocytes

Question 4

If a burn destroys the stratum basale, what is the most likely consequence for skin regeneration?

Accepted Answer

No regeneration because stem cells are lost

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

A biopsy reveals cells with abundant keratin filaments and desmosomes. Which epidermal layer is most likely being examined?

Accepted Answer

Stratum spinosum

Question 7

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

Accepted Answer

Immune defense

Question 8

During the process of keratinization, which change occurs as cells move from the stratum basale to the stratum corneum?

Accepted Answer

Cells lose water and become flattened

Question 9

Which equation best represents the relationship between the rate of epidermal cell division ($$R) $$and the time required for complete epidermal turnover ($$T$$), assuming a constant number of layers ($$N$$)?

Accepted Answer

$$T = \frac{N}{R}$$

Question 10

A patient with a deficiency in collagen synthesis would most likely have problems in which layer of the skin?

Accepted Answer

Dermis

Question 11

Which connective tissue type is most abundant in the papillary layer of the dermis?

Accepted Answer

Loose areolar connective tissue

Question 12

A histological section of skin shows dense irregular connective tissue, blood vessels, and nerve fibers. Which layer is being observed?

Accepted Answer

Reticular dermis

Question 13

Which of the following is a function of the hypodermis?

Accepted Answer

Fat storage and insulation

Question 14

A patient with a mutation in the gene for elastin would most likely experience which symptom?

Accepted Answer

Reduced skin elasticity

Question 15

Which of the following best explains why the stratum corneum is an effective barrier to water loss?

Accepted Answer

It is composed of dead, keratinized cells and lipids

Question 16

A patient presents with a loss of tactile sensation in the skin. Which cell type is most likely damaged?

Accepted Answer

Merkel cells

Question 17

Which layer of the skin contains the majority of blood vessels and nerves?

Accepted Answer

Dermis

Question 18

If the thickness of the stratum corneum ($$d) $$increases due to chronic friction, which equation best describes the change in the rate of water loss ($$W) $$through the skin, assuming $$k is a $$constant?

Accepted Answer

$$W = \frac{k}{d}$$

Question 19

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

Accepted Answer

Keratinized cells are shed from the surface

Question 20

A patient with an autoimmune disorder targeting desmosomes would most likely experience which symptom?

Accepted Answer

Blistering due to loss of cell adhesion

Integumentary System: Structure and Function of the Skin

Guida di studio - Domande di pratica

Study guide - Flashcard