Question 1

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

Accepted Answer

Provides the main site of active mitosis for new keratinocyte production

Question 2

A patient presents with yellow-tinged skin and sclera. Which underlying condition is most likely responsible for this clinical sign?

Accepted Answer

Liver disorder causing jaundice

Question 3

Which of the following is NOT a function of the subcutaneous tissue (hypodermis)?

Accepted Answer

Serving as the main site of active mitosis for keratinocytes

Question 4

A surgeon is planning an incision on the trunk. Why is it important to consider cleavage (tension) lines in the reticular dermis?

Accepted Answer

Incisions parallel to cleavage lines heal more readily and with less scarring

Question 5

Which pigment is responsible for the pinkish hue of fair skin and where is it primarily found?

Accepted Answer

Hemoglobin; capillaries in the dermis

Question 6

A burn patient is brought to the ER with burns covering the anterior and posterior surfaces of both legs and the anterior trunk. Using the rule of nines, what percentage of the body surface area is affected?

Accepted Answer

$$54\%$$

Question 7

Which of the following best explains why third-degree burns are life-threatening?

Accepted Answer

They destroy the entire thickness of the skin, leading to dehydration and electrolyte imbalance

Question 8

Which cell type in the epidermis is primarily responsible for activating the immune response by presenting antigens to white blood cells?

Accepted Answer

Dendritic (Langerhans) cells

Question 9

A patient is prescribed a topical medication that must penetrate the skin to reach the bloodstream. Which property of the stratum corneum allows certain substances to cross this barrier?

Accepted Answer

Lipid-soluble substances can penetrate due to the lipid-rich extracellular matrix

Question 10

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

Accepted Answer

Eccrine glands are most abundant on palms, soles, and forehead, and function in thermoregulation; apocrine glands are found in axillary and anogenital areas and begin functioning at puberty

Question 11

A patient with a genetic defect in tyrosinase is likely to have which of the following symptoms?

Accepted Answer

Lack of melanin production, resulting in albinism

Question 12

Which of the following is a correct sequence of layers pierced by a nail entering the skin from the surface to the dermis on the palm?

Accepted Answer

Stratum corneum → stratum granulosum → stratum spinosum → stratum basale → dermis

Question 13

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

Accepted Answer

The dermal vascular plexus can hold up to $$5\% of $$the body's total blood volume

Question 14

A patient presents with brown or black patches of thickened skin in body folds. Which underlying condition should be considered?

Accepted Answer

Endocrine disorder

Question 15

Which of the following is a function of sebum produced by sebaceous glands?

Accepted Answer

Provides bactericidal action and softens hair and skin

Question 16

Which of the following best describes the role of the arrector pili muscle?

Accepted Answer

Contracts to cause 'goose bumps' by pulling the hair follicle upright

Question 17

A patient with a large, irregularly pigmented skin lesion is evaluated using the ABCD rule. Which feature is most concerning for melanoma?

Accepted Answer

Diameter greater than $$6\ \mathrm{mm}$$

Question 18

Which of the following is a metabolic function of the skin that is essential for bone health?

Accepted Answer

Synthesis of vitamin D for calcium absorption

Question 19

A patient with uncontrolled diabetes develops horizontal lines across their nails. What is the clinical term for this finding?

Accepted Answer

Beau's lines

Question 20

Which of the following best explains why the stratum corneum is an effective physical barrier?

Accepted Answer

It consists of flat, dead, keratinized cells surrounded by glycolipids

Chapter 5: The Integumentary System

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