Question 1

Which of the following correctly identifies the two main layers of the skin and distinguishes them from the hypodermis?

Accepted Answer

Epidermis and dermis; the hypodermis is a subcutaneous layer beneath the skin, not part of the skin itself.

Question 2

Arrange the strata of the epidermis in thick skin from deepest to most superficial. Which layer contains mitotic cells responsible for cell replacement?

Accepted Answer

Stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, stratum corneum; stratum basale contains mitotic cells.

Question 3

Why is diffusion between the epidermis and the underlying dermis essential for skin health?

Accepted Answer

It supplies nutrients and oxygen to avascular epidermal cells, supporting cell survival and function.

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

What is the main function of keratin in the epidermis?

Accepted Answer

To provide structural strength and waterproofing to the skin.

Question 6

Which layer of the dermis contains the majority of the skin’s blood vessels, nerves, and glands?

Accepted Answer

Reticular layer

Question 7

A patient presents with a burn that affects only the epidermis. Which layer is most likely involved, and what is the expected healing process?

Accepted Answer

Stratum basale; rapid healing due to mitotic activity.

Question 8

Which structure is responsible for the formation of hair and contains actively dividing cells?

Accepted Answer

Hair matrix

Question 9

What is the primary function of the arrector pili muscle?

Accepted Answer

To contract and cause hair to stand upright, producing 'goosebumps'.

Question 10

Sebaceous glands secrete sebum. What is the main role of sebum in skin physiology?

Accepted Answer

To lubricate and waterproof the skin and hair.

Question 11

Which type of sudoriferous (sweat) gland is primarily responsible for thermoregulation and is widely distributed across the body?

Accepted Answer

Eccrine gland

Question 12

Apocrine sweat glands differ from eccrine sweat glands in which of the following ways?

Accepted Answer

Apocrine glands secrete into hair follicles and are activated during puberty, while eccrine glands secrete directly onto the skin surface and function in thermoregulation.

Question 13

Which part of the nail is responsible for its growth and contains actively dividing cells?

Accepted Answer

Nail matrix

Question 14

A patient has yellowish skin coloration. Which pigment is most likely responsible for this change?

Accepted Answer

Carotene

Question 15

Which pigment gives skin a reddish hue and is affected by blood oxygenation levels?

Accepted Answer

Hemoglobin

Question 16

A person with albinism lacks which pigment, resulting in very light skin, hair, and eyes?

Accepted Answer

Melanin

Question 17

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

Accepted Answer

They act as immune cells, detecting and presenting antigens to T cells.

Question 18

A patient presents with a wound that exposes the papillary layer of the dermis. Which structures are most likely to be affected?

Accepted Answer

Capillaries and sensory nerve endings

Question 19

Which formula best represents the relationship between the rate of diffusion ($$R) of $$oxygen from the dermis to the epidermis and the thickness ($$d) of $$the epidermis, assuming all other factors are constant?

Accepted Answer

$$R = \frac{D \cdot A \cdot (C_1$ - C_2$)}{d}$$

Question 20

A patient has a genetic mutation affecting Merkel cells. Which sensory function is most likely impaired?

Accepted Answer

Light touch sensation

Integumentary System: Structure and Function of Skin, Hair, Nails, and Glands

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