Question 1

Which of the following best describes the main function of the stratum corneum in the epidermis?

Accepted Answer

It provides a barrier against biological, chemical, and physical assaults by consisting of 20-30 layers of dead, keratinized cells.

Question 2

A patient presents with a bluish tint to their skin (cyanosis). Which of the following is the most likely physiological explanation?

Accepted Answer

Low oxygenation of hemoglobin in the blood.

Question 3

Which layer of the skin is primarily responsible for providing strength, elasticity, and housing most of the skin's blood vessels and nerves?

Accepted Answer

Dermis

Question 4

A surgeon is planning an incision on a patient’s back. To minimize scarring and promote faster healing, the incision should be made:

Accepted Answer

Parallel to the cleavage (tension) lines of the dermis.

Question 5

Which of the following best explains why third-degree burns are often painless?

Accepted Answer

Nerve endings in the affected area are destroyed.

Question 6

A person with a genetic mutation that prevents the production of tyrosinase would most likely exhibit which of the following symptoms?

Accepted Answer

Lack of melanin production, resulting in very pale skin and hair (albinism).

Question 7

Which of the following is a function of eccrine (merocrine) sweat glands?

Accepted Answer

Producing sweat primarily for thermoregulation.

Question 8

A patient with a large, irregularly pigmented mole is concerned about melanoma. According to the ABCD rule, which characteristic is most concerning for malignancy?

Accepted Answer

D: The diameter is larger than 6 mm.

Question 9

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, accumulating keratin and eventually dying.

Question 10

A patient is diagnosed with hirsutism. Which of the following is the most likely underlying cause?

Accepted Answer

Excessive androgen production, often due to tumors or polycystic ovary syndrome.

Question 11

Which of the following substances is most likely to penetrate the skin barrier and enter the bloodstream?

Accepted Answer

Lipid-soluble substances such as organic solvents

Question 12

A patient presents with yellow-tinged skin and sclera. Which of the following is the most likely cause?

Accepted Answer

Liver dysfunction leading to jaundice

Question 13

Which of the following best explains why the skin is able to act as a blood reservoir?

Accepted Answer

The dermal blood vessels can hold up to 5% of the body's total blood volume and can constrict to redirect blood to other organs.

Question 14

A patient is exposed to a chemical that denatures proteins and destroys cells in the skin. Which of the following is the most immediate threat to life?

Accepted Answer

Dehydration and electrolyte imbalance

Question 15

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

Accepted Answer

They are macrophages that patrol the epidermis and activate the immune system.

Question 16

A patient with a severe burn is found to have blisters, redness, and pain, but the burn does not extend through the entire dermis. According to burn classification, this is a:

Accepted Answer

Second-degree (partial-thickness) burn

Question 17

Which of the following is a metabolic function of the skin?

Accepted Answer

Synthesis of vitamin D for calcium absorption

Question 18

A patient is found to have horizontal ridges (Beau's lines) across their nails. Which of the following is the most likely explanation?

Accepted Answer

A recent severe illness such as uncontrolled diabetes or heart attack

Question 19

Which of the following best explains why elderly individuals are more prone to skin infections and cancer?

Accepted Answer

Decreased numbers of melanocytes and dendritic cells

Question 20

A patient with a genetic disorder has a defect in the desmosomes of their epidermal cells. Which of the following symptoms would most likely be observed?

Accepted Answer

Fragile skin that blisters easily due to poor cell-to-cell adhesion

The Integumentary System: Structure and Components

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