Question 1

Which of the following best explains why the stratum corneum is an effective barrier against water loss and microbial invasion?

Accepted Answer

It is composed of dead, keratinized cells with reduced desmosomes and a high lipid content.

Question 2

A patient presents with a burn that is red, painful, and has blisters. Which layer(s) of the skin are most likely affected, and what is the classification of this burn?

Accepted Answer

Epidermis and part of the dermis; second-degree (partial thickness) burn

Question 3

Which structure is responsible for producing the pigment that protects the skin from ultraviolet (UV) radiation, and how is its activity regulated?

Accepted Answer

Melanocytes; regulated by genetic factors and exposure to sunlight

Question 4

A surgical incision is made parallel to a tension line in the skin. What is the most likely outcome compared to a perpendicular incision?

Accepted Answer

The wound will remain closed and heal quickly with minimal scarring.

Question 5

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

Accepted Answer

Keratinocytes migrate from the stratum basale to the stratum corneum, losing their nuclei and accumulating keratin.

Question 6

A patient with albinism lacks pigmentation in their skin and hair. What is the underlying cause of this condition?

Accepted Answer

A single gene mutation resulting in the inability to produce melanin

Question 7

Which of the following best explains why elderly individuals are more prone to overheating?

Accepted Answer

Decreased perspiration due to less active sweat glands and reduced blood supply to the skin

Question 8

A person receives a deep laceration that damages the dermis. Which of the following structures is LEAST likely to regenerate during healing?

Accepted Answer

Hair follicles

Question 9

Which of the following is a function of the acid mantle on the skin's surface?

Accepted Answer

It inhibits the growth of most bacteria due to its acidic pH.

Question 10

A patient has a genetic mutation that prevents the production of vitamin D3 in the skin. Which of the following physiological processes would be most directly affected?

Accepted Answer

Calcium absorption and bone mineralization

Question 11

Which of the following best describes the role of lamellar (Pacinian) corpuscles in the skin?

Accepted Answer

They sense deep pressure and vibration in the dermis and subcutaneous tissue.

Question 12

A patient presents with a bluish discoloration of the skin (cyanosis). Which of the following best explains this finding?

Accepted Answer

Reduced oxygen content in the blood, leading to increased deoxyhemoglobin

Question 13

Which of the following equations best represents the relationship between heat loss by evaporation ($Q_{evap}$), mass of sweat evaporated ($m$), and the latent heat of vaporization ($L_v$)?

Accepted Answer

$Q_{evap} = m 	imes L_v$

Question 14

A patient has a wound that is healing with excessive scar tissue that extends beyond the original injury site. What is this type of scar called?

Accepted Answer

Keloid

Question 15

Which of the following best describes the function of sebaceous glands?

Accepted Answer

They produce an oily substance that lubricates the skin and hair.

Question 16

A person with a mutation in the gene for collagen synthesis would most likely experience which of the following symptoms?

Accepted Answer

Fragile skin that is easily torn and poor wound healing

Question 17

Which of the following best explains why the palms of the hands and soles of the feet have thicker stratum corneum compared to other body regions?

Accepted Answer

They are exposed to greater mechanical stress and friction.

Question 18

Which of the following statements about hair growth is correct?

Accepted Answer

Hair growth occurs in cycles, including anagen (growth), catagen (transition), and telogen (resting) phases.

Question 19

A patient with a deficiency in epidermal growth factor (EGF) would most likely experience which of the following?

Accepted Answer

Slower wound healing and reduced keratinocyte proliferation

Question 20

Which of the following best describes the difference between eccrine and apocrine sweat glands?

Accepted Answer

Eccrine glands are most numerous on the palms and soles and secrete a watery fluid for thermoregulation, while apocrine glands are found in the axillae and groin and secrete a viscous fluid associated with body odor.

Integumentary System: Structure, Function, and Clinical Relevance

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